Add dot notation support for "Firestore Collection Fields" param

[shaunbyrnes]

As discussed in Slack, add dot notation support for "Firestore Collection Fields" param, so that user can access any level property on fields they want to explicity include in the trigger.

[jasonbosco]

@shaunbyrnes We've added this feature in this release: https://github.com/typesense/firestore-typesense-search/releases/tag/v1.5.0-rc.2

Could you try that version and let me know how it goes?