Emacs UI LSP configuration for Clojure LSP

[practicalli-johnny]

• [x] Provide a minimal setup for Clojure LSP / Emacs LSP UI in the practicalli/spacemacs.d repository
• [ ] Add quick start section on https://practical.li/spacemacs/install-spacemacs/clojure-lsp/
• [ ] Explain the Practicalli configuration for LSP with CIDER
• [ ] Describe additional configuration that may be desirable and link to the canonical reference pages

Canonical pages: https://emacs-lsp.github.io/lsp-mode/tutorials/clojure-guide/ https://emacs-lsp.github.io/lsp-mode/tutorials/how-to-turn-off/