Add support for Firestore Enterprise Pipeline Queries

Firestore has recently launched Pipeline operations in Enterprise edition.
These powerful queries allow for complex transformations, aggregations, and
filtering that go beyond what Core operations currently support.

It would be beneficial for AngularFire to provide wrappers
for Pipeline operations to maintain parity with the Firestore JS SDK and
provide a better Angular developer experience.

In my opinion, the ability to perform searches using regex is the most important feature.

Has a date already been set for implementation?

Thanks for your work.

Inizia esaminando i wrapper Firestore esistenti di AngularFire e l'API Enterprise Pipeline Queries dell'SDK Firestore JS. Conferma le operazioni Pipeline supportate, incluse le ricerche regex, quindi definisci la superficie del wrapper necessaria per la parità con Angular; il lavoro è completato quando le operazioni supportate sono esposte e coperte da test appropriati.

Scritto dal modello di indicizzazione a partire dal testo della issue.