Add :tools lsp checks for +lsp flag

Also:
- Reorganizes some :lang modules' packages.el file.
- Adds setuptools check in lang/python
- Adds javac check in lang/java
- Removes the depends-on! macro

modules/lang/go/doctor.el

@@ -1,6 +1,10 @@
 ;; -*- lexical-binding: t; no-byte-compile: t; -*-
 ;;; lang/go/doctor.el
 
+(assert! (or (not (featurep! +lsp))
+             (featurep! :tools lsp))
+         "This module requires (:tools lsp)")
+
 (unless (executable-find "guru")
   (warn! "Couldn't find guru. Refactoring commands (go-guru-*) won't work"))