feat(lsp): add Tombi language server configuration

Author: ya7010

lsp/tombi.lua

@@ -0,0 +1,11 @@
+---@brief
+---
+--- https://tombi-toml.github.io/tombi/
+---
+--- Language server for Tombi, a TOML toolkit.
+---
+return {
+  cmd = { 'tombi', 'lsp' },
+  filetypes = { 'toml' },
+  root_markers = { 'tombi.toml', '.git' },
+}