refactor: auto-generate language configuration (#1584)

Refactor the monolithic `lvim.lang` design into a more modular approach.

IMPORTANT: run `:LvimUpdate` in order to generate the new ftplugin template files.

lua/bootstrap.lua

@@ -85,9 +85,10 @@ function M:init()
     vim.cmd("set spellfile=" .. join_paths(self.config_dir, "spell", "en.utf-8.add"))
   end
 
+  vim.fn.mkdir(vim.fn.stdpath "cache", "p")
+
   -- FIXME: currently unreliable in unit-tests
   if not os.getenv "LVIM_TEST_ENV" then
-    vim.fn.mkdir(vim.fn.stdpath "cache", "p")
     require("impatient").setup {
       path = vim.fn.stdpath "cache" .. "/lvim_cache",
       enable_profiling = true,
@@ -112,6 +113,7 @@ end
 function M:update()
   M:update_repo()
   M:reset_cache()
+  require("lsp.templates").generate_templates()
   vim.schedule(function()
     -- TODO: add a changelog
     vim.notify("Update complete", vim.log.levels.INFO)