Payloads too large return undocumented "Android message is too big"

### [REQUIRED] Step 2: Describe your environment

* Operating System version: Mac OS 13.5.2
* Firebase SDK version: 4.12.0
* Library version: _____
* Firebase Product: _____ (auth, database, storage, etc)

### [REQUIRED] Step 3: Describe the problem

#### Steps to reproduce:

* Send a notification where `Data` is `{"a": x}` where x is a random 8000 byte string
* What happens: BatchResponse has undocumented error "Android message is too big"
* Expected: either a documented error code, or for the messaging namespace to expose an `IsMessageToLarge` or similar method, similar top `messaging.IsSenderIDMismatch`, `messaging.IsUnregistered`, etc

Start in the messaging namespace by reproducing the notification with an approximately 8000-byte data value and observing the BatchResponse error. Compare the undocumented "Android message is too big" result with existing messaging error helpers such as IsSenderIDMismatch and IsUnregistered; done when the size failure is documented or exposed through a comparable helper.

Written by the indexing model from the issue text.