feat(lsp): drop fswatch, use inotifywait (#29374)

This patch replaces fswatch with inotifywait from inotify-toools:

https://github.com/inotify-tools/inotify-tools

fswatch takes ~1min to set up recursively for the Samba source code
directory. inotifywait needs less than a second to do the same thing.

https://github.com/emcrisostomo/fswatch/issues/321

Also it fswatch seems to be unmaintained in the meantime.

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>

runtime/lua/vim/lsp/_watchfiles.lua

@@ -9,8 +9,8 @@ local M = {}
 
 if vim.fn.has('win32') == 1 or vim.fn.has('mac') == 1 then
   M._watchfunc = watch.watch
-elseif vim.fn.executable('fswatch') == 1 then
-  M._watchfunc = watch.fswatch
+elseif vim.fn.executable('inotifywait') == 1 then
+  M._watchfunc = watch.inotify
 else
   M._watchfunc = watch.watchdirs
 end