Handle OSC sequences in term (bug#78263)

Handle OSC sequences in term (bug#78263)

Handlers can be registered to term-osc-handler, which by defaults,
supports OSC 0, 2, 7 and 8, using handlers defined in ansi-osc.
Unknown OSC sequences are ignored.

* lisp/term.el (term-emulate-terminal): Handle OSC sequences.
(term-osc-handler): New configuration variable.
(term-control-seq-regexp): Extended regexp.
(term--osc-max-bytes): New private constant.
* lisp/ansi-osc.el (ansi-osc-handler): Handle OSC 0 like OSC 2.
* test/lisp/term-tests.el (term-ignore-osc, term-handle-osc)
(term-call-ansi-osc-handlers): New tests.

(cherry picked from commit 6c13da2caf629b14853e9aa57e59aeeeec14e68f)