✨ Add unique request id for every request

[aswetlow]

Proposed Changes

Adds $id property to the Jovo object which is a unique request id. The id is retrieved from the request payload or is a generated UUID v4, if the platform doesn't provide a request id.

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

[jankoenig]

Thanks!