Add all-clusters-app.zap file to all-clusters-app

[vivien-apple]

Problem

This PR contains the .zap configuration that maps the current configuration of the gen/ folder fore the all-clusters-app demo.

This is similar to #3610 and #3882

For example, one may generate the content of gen/ folder running:

./scripts/tools/zap_generate.sh examples/all-clusters-app/all-clusters-common/all-clusters-app.zap

There is still a difference between this ZAP configuration and the current AppBuilder configuration though.
The current AppBuilder configuration uses 2 endpoints, while this configuration file uses 1. The rationale behind that is because ZAP does not (yet) generate endpoint_config.h which contains the code to deal with multiple endpoints.

I though it would make sense to wait for ZAP to be able to generate endpoint_config.h before adding this endpoint to the configuration file. But if reviewers think otherwise I can add it now.

At some point, we will get rid of the code of the gen/ folder. And the code should be generated from this file.

Summary of Changes

• Add all-clusters-app.zap into examples/all-clusters-app/all-clusters-common

[bzbarsky-apple]

Rubber-stamping this for now. The real test will be when we generate gen from this an there are no changes, or we review the changes and they're ok....