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

[froodian]

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[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

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