feat(lsp): refactor

* Move configs into config subdirectory
 * Move LSP logic into classes
 * Make it possible to define mason package in lsp config,
   including nested dependency resolution and post install
   steps
 * replace jedi_language_server with pylsp

lua/lsp/config/clangd.lua

@@ -0,0 +1,23 @@
+return {
+    enable = true,
+    mason = {
+        name = "clangd",
+        -- version = "",
+    },
+    lspconfig = {
+        filetypes = {
+            "c",
+            "cpp",
+            "objc",
+            "objcpp",
+            "cuda",
+            "proto",
+        },
+        cmd = {
+            "clangd",
+            "--clang-tidy",
+            "--enable-config",
+        },
+        single_file_support = true,
+    },
+}