feat/refacto: improve configurations

- You should now get the configs through functions
- Configs for languages are now inside a local object called parsers
- You can get the parser installation configurations with `get_parser_configs`
- A new object has been initialized inside configs to specify module config (called config).
- Provide functions to enable/disable a module on one buffer
- Provide functions to enable/disable a module on all buffers, and if filetype is
  specified, for specific filetype
- Provide function to determine if module is activated for a specified filetype

lua/nvim-treesitter/utils.lua

@@ -63,4 +63,17 @@ function M.is_parent(dest, source)
   return false
 end
 
+function M.setup_commands(mod, commands)
+  for command_name, def in pairs(commands) do
+    local call_fn = string.format("lua require'nvim-treesitter.%s'.commands.%s.run(<f-args>)", mod, command_name)
+    local parts = vim.tbl_flatten({
+        "command!",
+        def.args,
+        command_name,
+        call_fn,
+      })
+    api.nvim_command(table.concat(parts, " "))
+  end
+end
+
 return M