tools/lsp: reduce lsp's self-configuring eagerness

The original `lsp' initializes too much, too quickly. Things like
flycheck, company, and yasnippet. Doom's modules already handle these
just fine, so we advice it to leave it to us to handle. I intentionally
avoid disabling lsp-auto-configure because doing so is much more
destructive than I'd like.

This update prevents lsp-ui-mode from being auto-enabled on lsp-mode.
You can now (remove-hook 'lsp-mode-hook #'lsp-ui-mode) to disable
lsp-ui.

This update also adds these two hooks:

+ +lsp|init-company (on `lsp-mode-hook')
+ +lsp|init-ui-flycheck-or-flymake (on `lsp-ui-mode-hook')

modules/tools/lsp/autoload.el

@@ -1,4 +1,23 @@
 ;;; feature/lsp/autoload.el -*- lexical-binding: t; -*-
 
 ;;;###autodef
-(defalias 'lsp! #'lsp)
+(defun lsp! (&optional arg)
+  "Enable `lsp-mode' in the current buffer.
+
+Meant to be a lighter alternative to `lsp', which is too eager about
+initializing lsp-ui-mode, company, yasnippet and flycheck. Instead, these have
+been moved out to their respective modules, or these hooks:
+
++ `+lsp|init-company' (on `lsp-mode-hook')
++ `+lsp|init-ui-flycheck-or-flymake' (on `lsp-ui-mode-hook')"
+  (when lsp-auto-configure
+    (require 'lsp-clients))
+  (when (and (buffer-file-name)
+             (setq-local lsp--buffer-workspaces
+                         (or (lsp--try-open-in-library-workspace)
+                             (lsp--try-project-root-workspaces (equal arg '(4))
+                                                               (and arg (not (equal arg 1)))))))
+    (lsp-mode 1)
+    (lsp--info "Connected to %s."
+               (apply 'concat (--map (format "[%s]" (lsp--workspace-print it))
+                                     lsp--buffer-workspaces)))))