Rust ts: fontify as type the possible suffix of number literals

Rust ts: fontify as type the possible suffix of number literals

* lisp/progmodes/rust-ts-mode.el
(rust-ts-mode--fontify-number-literal): Perform the improved
fontification of numbers.  (Bug#73877)
* test/lisp/progmodes/rust-ts-mode-tests.el:
* test/lisp/progmodes/rust-ts-mode-resources/font-lock.rs:
* test/lisp/progmodes/rust-ts-mode-resources/font-lock-number.rs:
Add tests for the new optional fontification of the possible type
suffix of numbers.

(cherry picked from commit 902696c3ae3ed046208c57de923362bb609da6df)