add `include` in the action schema

what:
- https://github.com/adobe/aio-cli/issues/207
- (tests) https://github.com/apache/openwhisk-wskdeploy/blob/8e4a79926039612c5242f06942c3382919acc021/tests/src/integration/zipactionwithinclude/manifest.yml

where:
https://github.com/adobe/aio-cli-lib-app-config/blob/9a1fcd14cb242b26a9c2ad7be728f44b9a28e363/schema/app.config.yaml.schema.json#L128

Start at schema/app.config.yaml.schema.json around line 128 and compare the linked openwhisk-wskdeploy manifest.yml test case. Update the action schema so the requested include form is accepted, then verify it against the referenced test configuration.

Written by the indexing model from the issue text.