Move lsp config to local file structure

.config/nvim/lsp/wasm_language_tools.lua

@@ -0,0 +1,12 @@
+---@brief
+---
+--- https://github.com/g-plane/wasm-language-tools
+---
+--- WebAssembly Language Tools aims to provide and improve the editing experience of WebAssembly Text Format.
+--- It also provides an out-of-the-box formatter (a.k.a. pretty printer) for WebAssembly Text Format.
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'wat_server' },
+  filetypes = { 'wat' },
+}