Move c-ts-mode--statement-offset to c-ts-common.el

Move c-ts-mode--statement-offset to c-ts-common.el

Now it can be used by other C-like languages.

* lisp/progmodes/c-ts-common.el (c-ts-common-indent-offset):
(c-ts-common-indent-block-type-regexp):
(c-ts-common-indent-bracketless-type-regexp): New variables.
(c-ts-common-statement-offset):
(c-ts-mode--fix-bracketless-indent):
(c-ts-mode--close-bracket-offset): New functions.

* lisp/progmodes/c-ts-mode.el (c-ts-mode--indent-styles): Change
c-ts-mode--statement-offset to c-ts-common-statement-offset.
The (parent-is "if_statement") rules are now handled by (node-is
"compound_statement").

(c-ts-mode--statement-offset-post-processr):
(c-ts-mode--statement-offset):
(c-ts-mode--fix-bracketless-indent): Move to c-ts-common.el.

(c-ts-base-mode): Setup c-ts-common stuff.

* test/lisp/progmodes/c-ts-mode-resources/indent.erts: Make the test
more challenging.