feat: generate names for tuple-struct in add-missing-match-arms
fix#18034.
This PR includes the following enhancement:
- Introduced a `NameGenerator` in `suggest_name`, which implements an automatic renaming algorithm to avoid name conflicts. Here are a few examples:
```rust
let mut generator = NameGenerator::new();
assert_eq!(generator.suggest_name("a"), "a");
assert_eq!(generator.suggest_name("a"), "a1");
assert_eq!(generator.suggest_name("a"), "a2");
assert_eq!(generator.suggest_name("b"), "b");
assert_eq!(generator.suggest_name("b"), "b1");
assert_eq!(generator.suggest_name("b2"), "b2");
assert_eq!(generator.suggest_name("b"), "b3");
assert_eq!(generator.suggest_name("b"), "b4");
assert_eq!(generator.suggest_name("b3"), "b5");
```
- Updated existing testcases in ide-assists for the new `NameGenerator` (only modified generated names).
- Generate names for tuple structs instead of using wildcard patterns in `add-missing-match-arms`.
a91ca0e2fc