refactor(tty): tty.request() #39489

Problem:
- Various `TermRequest` handlers which all do similar things.
- `tty.query` is specific to `XTGETTCAP DCS`, can't be reused for other kinds of terminal queries.

Solution:
Provide `tty.request()`.

runtime/lua/vim/_meta.lua

@@ -31,6 +31,7 @@ vim.secure = require('vim.secure')
 vim.snippet = require('vim.snippet')
 vim.text = require('vim.text')
 vim.treesitter = require('vim.treesitter')
+vim.tty = require('vim.tty')
 vim.ui = require('vim.ui')
 vim.version = require('vim.version')