fix: Handle double quotes inside quoted identifiers correctly (#411)

* fix: Handle double quotes inside quoted identifiers correctly

This fixes #410 for standard SQL, however I don't know enough about other dialects to know if they
handle this differently. May need more extensive testing as well.

* refactor: Make quoted identifier parsing a seperate function

* test: Check that quoted identifier tokenization works

Added `pretty_assertions` so that the `assert_eq!` in the tokenization is readable

* test: Check that quoted identifiers work in mysql

* chore: cargo clippy

src/lib.rs

@@ -39,6 +39,10 @@
 #[cfg(not(feature = "std"))]
 extern crate alloc;
 
+#[macro_use]
+#[cfg(test)]
+extern crate pretty_assertions;
+
 pub mod ast;
 #[macro_use]
 pub mod dialect;