refactor: integer functions, optimize asserts #34112

refactor(lua): add integer coercion helpers

Add vim._tointeger() and vim._ensure_integer(), including optional base
support, and switch integer-only tonumber()/assert call sites in the Lua
runtime to use them.

This also cleans up related integer parsing in LSP, health, loader, URI,
tohtml, and Treesitter code.

supported by AI

runtime/lua/vim/lsp/client.lua

@@ -713,10 +713,8 @@ end
 --- @see |vim.lsp.buf_request_all()|
 function Client:request(method, params, handler, bufnr)
   if not handler then
-    handler = assert(
-      self:_resolve_handler(method),
-      string.format('not found: %q request handler for client %q.', method, self.name)
-    )
+    handler = self:_resolve_handler(method)
+      or error(('not found: %q request handler for client %q.'):format(method, self.name))
   end
   -- Ensure pending didChange notifications are sent so that the server doesn't operate on a stale state
   changetracking.flush(self, bufnr)