chore(release): Release v7

[jamesdaniels]

• remove @next references
• remove @next warning
• update actions with stable version
• update dependency with stable versions
• update branch protection rules
• get upgrade guide in passable shape
• add modular section to docs
• fix ng upgrade to install peers
• add rxfire to the peerDepedencies
• add sync auth resolution to database/firestore
• changelog entry

[hakimio]

@jamesdaniels You have noted the new API isn't feature complete. What features exactly are missing?

[DavidWeiss2]

@jamesdaniels collection<T> and other generics in the docs are not generics in the implementation. The implementation gives a const type of CollectionReference and is not receiving any type as input.