Handle raw identifiers in proc macro server Fixes #13706 When proc macros create `proc_macro::Ident`s, they pass an identifier text without "r#" prefix and a flag `is_raw` to proc macro server. Our `tt::Ident` currently stores the text *with* "r#" so we need to adjust them somewhere. Rather than following rustc and adding `is_raw` field to our `tt::Ident`, I opted for adjusting the representation of identifiers in proc macro server, because we don't need the field outside it. It's hard to write regression test for this, but at least I: - ran `cargo +nightly t --features sysroot-abi` and all the tests passed - built proc macro server with `cargo +nightly b -r --bin rust-analyzer-proc-macro-srv --features sysroot-abi` and made sure #13706 resolved - For the record, the nightly versions used are `rustc 1.67.0-nightly (32e613bba 2022-12-02)` and `cargo 1.67.0-nightly (e027c4b5d 2022-11-25)`.
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