Rollup merge of #72884 - Julian-Wollersberger:raw_str_error_cleanup, r=petrochenkov

RawString error reporting cleanup

I simplified how errors with raw string are represented in the lexer and reportet in the parser, by using one enum instead of two structs with impls. This makes 70 code lines obsolete.

I also noticed some other things (2nd commit) and added a missing test for the `too many '#' symbols' error.

My original intent was to improve performance, but the only thing I found was to inline some functions in `cursor.rs`. It's effect is barely measurable, though.

There is one open question. Before, the compiler aborts when encountering the `too many '#' symbols` error. Now the lexer says in this case that there are 0 hashes, and then later the parser aborts on the error.
I'm worrying that the parser may be changed to recover and continue, and then later stages will see the wrong numer of hashes and act strange. (eg. the `format!` macro expansion).
Is that possibility important enough today to worry about it?

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