feat(postgres_lsp): port config for neovim 0.11

Author: TheRealLorenz

lsp/postgres_lsp.lua

@@ -0,0 +1,12 @@
+---@brief
+---
+---https://pgtools.dev
+--
+-- A collection of language tools and a Language Server Protocol (LSP) implementation for Postgres, focusing on developer experience and reliable SQL tooling.
+return {
+  cmd = { 'postgrestools', 'lsp-proxy' },
+  filetypes = {
+    'sql',
+  },
+  root_markers = { 'postgrestools.jsonc' },
+}