`code_action` gained extra functions (`filter` and `apply`) which
`range_code_action` didn't have.
To close this gap, this adds a `range` option to `code_action` and
deprecates `range_code_action`.
The option defaults to the current selection if in visual mode.
This allows users to setup a mapping like `vim.keymap.set({'v', 'n'},
'<a-CR>', vim.lsp.buf.code_action)`
`range_code_action` used to use the `<` and `>` markers to get the
_last_ selection which required using a `<Esc><Cmd>lua
vim.lsp.buf.range_code_action()<CR>` (note the `<ESC>`) mapping.
98915f88b2
