Enhance local document types

[openscript]

This PR contains:

• IMPROVED typings

Describe the problem you have without this PR

The typing of insertLocal in rx-database.d.ts and rx-collection.d.ts was the following:

    insertLocal<LocalDocType = any>(id: string, data: any): Promise<...>;

I haven't discovered any reason, why data should not be typed with the LocalDocType as upsertLocal() does it too.

There was also some code redundancy between rx-database.d.ts and rx-collection.d.ts, which was resolved as well.

A typing test was added accordingly.

[pubkey]

@openscript thank you. Merged.