feat: supports minus to underscore rename

[A4-Tacks]

Typing minus is usually much more convenient than typing underscore

Example

Rename to "a-b"

fn main() { let i$0 = 1; }

Before this PR

Invalid name a-b: not an identifier

After this PR

fn main() { let a_b = 1; }

[lnicola]

The change looks fine to me, but that's not a typo I've ever made and I'm not aware of other LSP servers that do this. The Python one in VS Code simply renames to a-b.

View changes since this review

[A4-Tacks]

I'm not aware of other LSP servers that do this. The Python one in VS Code simply renames to a-b.

This feature is very useful, but there seems to be no other LSP or IDE implementation

PyCharm, jedils, tsserver, luals, ocamllsp and clangd have not implemented this