[firebase_analytics] Endorse web implementation. (firebase#2865)

* [firebase_analytics] Endorse web implementation.

[firebase_analytics_web] Add noop ios podspec (firebase#2844)

[firebase_analytics_web] Add initial implementation for firebase_anal…

…ytics_web (firebase#2573)

[firebase_analytics] Wire the platform interface. (firebase#2572)

* Make firebase_analytics use the platform interface.

[firebase_admob] Use instance variables when loading ads (firebase#2382)

Migrate cloud_firestore to android v2 embedding. (firebase#2269)

[firebase_auth] Migrate to Android v2 embedder. (firebase#2275)

[firebase_storage] Add macOS support (firebase#2102)

* [firebase_storage] Add macOS support

* Remove UserAgent

Co-authored-by: Francisco Magdaleno <[email protected]>

[firebase_storage] Add macOS support (firebase#2102)

* [firebase_storage] Add macOS support

* Remove UserAgent

Co-authored-by: Francisco Magdaleno <[email protected]>

[cloud_firestore_web] Ensure Query pagination methods encode values. (f…

…irebase#2166)

This change ensures that the package:firestore Query objects are created with properly encoded values when done so from the start/end (pagination) methods.

This also adds some Timestamps to the unit tests to verify the behavior of Timestamp -> DateTime in the web implementation.

(There are some integration tests in cloud_firestore that cover this behavior further.)

Fixes firebase#2153

* [cloud_firestore_platform_interface] Fix 'equal_keys_in_map' lint (unrelated fix, but this change triggered an analysis in a sibling package)