✨ Add addEventFilter for analytics-bigquery

[sadlowskij]

Proposed Changes

This change should give the user more control over what is to be sent to the BigQuery Table. When working with bigger voice apps, multiple events per request can lead to huge amounts of BigQuery table rows that might not be needed in a give case. This filter function gives the user the chance to filter out events by eventType, user, or whatever they want.

If there are any issues with this, feel free to let me know!

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 a lot @sadlowskij 🎉