Tweak faces in Java and TypeScript

Tweak faces in Java and TypeScript

* lisp/progmodes/java-ts-mode.el (java-ts-mode--operators): Remove @
as an operator.

(java-ts-mode--font-lock-settings): Use constant-face for @ to match
rest of the annotation.  Add bracket, delimiter and use some of the
new faces.

(java-ts-mode--imenu): Clean up the implementation a little.

(java-ts-mode): Refer to the new features.

* lisp/progmodes/ts-mode.el (ts-mode--font-lock-settings, ts-mode):
Add in bracket and delimiter'.