Add newly supported keywords to c-ts-mode (bug#75226)

Add newly supported keywords to c-ts-mode (bug#75226)

For the new keywords, test if the grammar supports them before
useing it.

* lisp/progmodes/c-ts-mode.el:
(c-ts-mode--optional-c-keywords): New variable.
(c-ts-mode--ms-keywords): New variable.
(c-ts-mode--compute-optional-keywords): New function.
(c-ts-mode--keywords): Add new optional keywords.
(c-ts-mode--c++-operators): New variable.
(c-ts-mode--c++-operator-keywords): New variable.
(c-ts-mode--font-lock-settings): Use c-ts-mode--c++-operators.

(cherry picked from commit 7d3bc1ff2f44215ad24fdd8b243e7cee8ff66fa0)