Add lsp (metabase#15181)

* Add lsp and config

```emacs-lisp
  (use-package lsp-mode
    :ensure t
    :hook ((clojure-mode . lsp)
           (clojurec-mode . lsp)
           (clojurescript-mode . lsp))
    :config
    (setq lsp-enable-indentation nil)
    (setq lsp-enable-file-watchers nil) ;; annoying and i can't specify paths
    ;; add paths to your local installation of project mgmt tools, like lein
    (dolist (m '(clojure-mode
                 clojurec-mode
                 clojurescript-mode
                 clojurex-mode))
       (add-to-list 'lsp-language-id-configuration `(,m . "clojure"))))
```

* Add socket repl support to project.clj (also include reveal)

* Configure lsp so that enterprise is on the classpath

.gitignore

@@ -77,3 +77,7 @@ dev/src/dev/nocommit/
 **/cypress_sample_dataset.json
 /frontend/src/cljs
 .shadow-cljs
+
+# lsp: ignore all but the config file
+.lsp/*
+!.lsp/config.edn

.lsp/config.edn

@@ -0,0 +1,4 @@
+{:keep-require-at-start?        true
+ :show-docs-arity-on-same-line? true
+ :project-specs                 [{:project-path "project.clj"
+                                  :classpath-cmd ["lein" "with-profile" "+ee" "classpath"]}]}

project.clj

@@ -191,6 +191,12 @@
    {:source-paths ["enterprise/backend/src"]
     :test-paths   ["enterprise/backend/test"]}
 
+   :socket
+   {:dependencies
+    [[vlaaad/reveal "1.3.196"]]
+    :jvm-opts
+    ["-Dclojure.server.repl={:port 5555 :accept clojure.core.server/repl}"]}
+
    :dev
    {:source-paths ["dev/src" "local/src"]
     :test-paths   ["test" "backend/mbql/test" "shared/test"]