add release please configuration

[baywet]

reflect the following changes
microsoftgraph/msgraph-sdk-java#1964
microsoftgraph/msgraph-sdk-java#1946
microsoftgraph/msgraph-sdk-java#1944
microsoftgraph/msgraph-sdk-java#1939

We want:

• release please header file (yaml .github/release-please.yml)
• release please manifest (json .release-please-manifest.json)
• release please config (json release-please-config.json)
• release please workflow to trigger on main branch (.github/workflows/release-please.yml) Using the release please GitHub app doesn't require this.
• release please secret setup RELEASE_PLEASE_TOKEN install the release please GitHub app to the repository
• changelog keep a changelog header and unreleased information to be removed
• contributing to be updated with commit formatting instructions
• version bump script to be deleted (and removed from the weekly generation process)
• files where the version needs to be updated to be ammended with the special comments for release please

[sebastienlevert]

Add full documentation of the release process

[calebkiage]

We don't need to set the RELEASE_PLEASE_TOKEN anymore since we're using a GitHub app. We just need to install the app in a repository. I've deleted the secret from the microsoftgraph/msgraph-sdk-java repository to avoid confusion.

[baywet]

Thanks for the additional information here. FYI I created all the install requests issues with the OSPO (see timeline on this and related issues)