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/cmake.lua

@@ -0,0 +1,23 @@
+return {
+    enable = true,
+    dependencies = {
+        "python3",
+    },
+    py_module_deps = {
+        "venv",
+    },
+    mason = {
+        name = "cmake-language-server",
+        -- version = "",
+    },
+    lspconfig = {
+        filetypes = {
+            "cmake",
+        },
+        cmd = { "cmake-language-server", },
+        single_file_support = true,
+        init_options = {
+            buildDirectory = "build",
+        },
+    },
+}