fix(derive): Mark all impls as automatically derived

Unsure what all it does.  I removed our `allow`s and we still get lints,
so unsure if its only some that it applies to it.

Inspired by #4951

clap_derive/src/derives/args.rs

@@ -99,6 +99,7 @@ pub fn gen_for_struct(
             clippy::suspicious_else_formatting,
             clippy::almost_swapped,
         )]
+        #[automatically_derived]
         impl #impl_generics clap::FromArgMatches for #item_name #ty_generics #where_clause {
             fn from_arg_matches(__clap_arg_matches: &clap::ArgMatches) -> ::std::result::Result<Self, clap::Error> {
                 Self::from_arg_matches_mut(&mut __clap_arg_matches.clone())
@@ -134,6 +135,7 @@ pub fn gen_for_struct(
             clippy::suspicious_else_formatting,
             clippy::almost_swapped,
         )]
+        #[automatically_derived]
         impl #impl_generics clap::Args for #item_name #ty_generics #where_clause {
             fn group_id() -> Option<clap::Id> {
                 #group_id

clap_derive/src/derives/into_app.rs

@@ -42,6 +42,7 @@ pub fn gen_for_struct(
             clippy::suspicious_else_formatting,
             clippy::almost_swapped,
         )]
+        #[automatically_derived]
         impl #impl_generics clap::CommandFactory for #item_name #ty_generics #where_clause {
             fn command<'b>() -> clap::Command {
                 let #app_var = clap::Command::new(#name);
@@ -82,6 +83,7 @@ pub fn gen_for_enum(
             clippy::suspicious_else_formatting,
             clippy::almost_swapped,
         )]
+        #[automatically_derived]
         impl #impl_generics clap::CommandFactory for #item_name #ty_generics #where_clause {
             fn command<'b>() -> clap::Command {
                 let #app_var = clap::Command::new(#name)

clap_derive/src/derives/parser.rs

@@ -86,6 +86,7 @@ fn gen_for_struct(
     let args = args::gen_for_struct(item, item_name, generics, fields)?;
 
     Ok(quote! {
+        #[automatically_derived]
         impl #impl_generics clap::Parser for #item_name #ty_generics #where_clause {}
 
         #into_app
@@ -105,6 +106,7 @@ fn gen_for_enum(
     let subcommand = subcommand::gen_for_enum(item, item_name, generics, variants)?;
 
     Ok(quote! {
+        #[automatically_derived]
         impl #impl_generics clap::Parser for #item_name #ty_generics #where_clause {}
 
         #into_app

clap_derive/src/derives/subcommand.rs

@@ -79,6 +79,7 @@ pub fn gen_for_enum(
             clippy::suspicious_else_formatting,
             clippy::almost_swapped,
         )]
+        #[automatically_derived]
         impl #impl_generics clap::FromArgMatches for #item_name #ty_generics #where_clause {
             fn from_arg_matches(__clap_arg_matches: &clap::ArgMatches) -> ::std::result::Result<Self, clap::Error> {
                 Self::from_arg_matches_mut(&mut __clap_arg_matches.clone())
@@ -105,6 +106,7 @@ pub fn gen_for_enum(
             clippy::suspicious_else_formatting,
             clippy::almost_swapped,
         )]
+        #[automatically_derived]
         impl #impl_generics clap::Subcommand for #item_name #ty_generics #where_clause {
             fn augment_subcommands <'b>(__clap_app: clap::Command) -> clap::Command {
                 #augmentation

clap_derive/src/derives/value_enum.rs

@@ -64,6 +64,7 @@ pub fn gen_for_enum(
             clippy::suspicious_else_formatting,
             clippy::almost_swapped,
         )]
+        #[automatically_derived]
         impl clap::ValueEnum for #item_name {
             #value_variants
             #to_possible_value

clap_derive/src/dummies.rs

@@ -7,6 +7,7 @@ use quote::quote;
 pub fn parser(name: &Ident) -> proc_macro2::TokenStream {
     let into_app = into_app(name);
     quote!(
+        #[automatically_derived]
         impl clap::Parser for #name {}
         #into_app
     )
@@ -15,6 +16,7 @@ pub fn parser(name: &Ident) -> proc_macro2::TokenStream {
 #[must_use]
 pub fn into_app(name: &Ident) -> proc_macro2::TokenStream {
     quote! {
+        #[automatically_derived]
         impl clap::CommandFactory for #name {
             fn command<'b>() -> clap::Command {
                 unimplemented!()
@@ -29,6 +31,7 @@ pub fn into_app(name: &Ident) -> proc_macro2::TokenStream {
 #[must_use]
 pub fn from_arg_matches(name: &Ident) -> proc_macro2::TokenStream {
     quote! {
+        #[automatically_derived]
         impl clap::FromArgMatches for #name {
             fn from_arg_matches(_m: &clap::ArgMatches) -> ::std::result::Result<Self, clap::Error> {
                 unimplemented!()
@@ -44,6 +47,7 @@ pub fn from_arg_matches(name: &Ident) -> proc_macro2::TokenStream {
 pub fn subcommand(name: &Ident) -> proc_macro2::TokenStream {
     let from_arg_matches = from_arg_matches(name);
     quote! {
+        #[automatically_derived]
         impl clap::Subcommand for #name {
             fn augment_subcommands(_cmd: clap::Command) -> clap::Command {
                 unimplemented!()
@@ -63,6 +67,7 @@ pub fn subcommand(name: &Ident) -> proc_macro2::TokenStream {
 pub fn args(name: &Ident) -> proc_macro2::TokenStream {
     let from_arg_matches = from_arg_matches(name);
     quote! {
+        #[automatically_derived]
         impl clap::Args for #name {
             fn augment_args(_cmd: clap::Command) -> clap::Command {
                 unimplemented!()
@@ -78,6 +83,7 @@ pub fn args(name: &Ident) -> proc_macro2::TokenStream {
 #[must_use]
 pub fn value_enum(name: &Ident) -> proc_macro2::TokenStream {
     quote! {
+        #[automatically_derived]
         impl clap::ValueEnum for #name {
             fn value_variants<'a>() -> &'a [Self]{
                 unimplemented!()