lua: Add highlight.on_yank (#12279)

* add lua function to highlight yanked region

* extract namespace, better naming, default values

* add default for event argument

* free timer

* factor out mark to position calculation

* d'oh

* make sure timer stops before callback (cf. luv example)

* factor out timer, more documentation

* fixup

* validate function argument for schedule

* fix block selection past eol

* correct handling of multibyte characters

* move arguments around, some cleanup

* move utility functions to vim.lua

* use anonymous namespaces, avoid local api

* rename function

* add test for schedule_fn

* fix indent

* turn hl-yank into proper (hightlight) module

* factor out position-to-region function

mark extraction now part of highlight.on_yank

* rename schedule_fn to defer_fn

* add test for vim.region

* todo: handle double-width characters

* remove debug printout

* do not shadow arguments

* defer also callable table

* whitespace change

* move highlight to vim/highlight.lua

* add documentation

* add @return documentation

* test: add check before vim.defer fires

* doc: fixup

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