Make interface for Standard query parameters

Apart from method specific parameters, the API offers certain standard query parameters, which can be used in all methods.
Create an interface for those `system parameters`, which are listed [here](https://cloud.google.com/apis/docs/system-parameters).
Refer to the already created interfaces in the `schemas.ts` file for creating the interface.

Another important task is to extend the standard query params to schemas of all the individual methods (defined by `schema_`) in the `schemas.ts` file.