Add 'icon' to '/messaging-types'

[zwu52]

This follows #6722 to supplement 'icon' also to the '/messaging-types' dir.

ref: b/241885017

[changeset-bot]

🦋 Changeset detected

Latest commit: 8a0ca1a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@firebase/messaging	Minor
firebase	Patch
@firebase/messaging-compat	Patch

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[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (3f1354f) and merge commit (24247ba).

Test Logs

• Base (3f1354f): https://github.com/firebase/firebase-js-sdk/actions/runs/3323890617
• Merge (24247ba): https://github.com/firebase/firebase-js-sdk/actions/runs/3331354423

1. https://storage.googleapis.com/firebase-sdk-metric-reports/FMmbC0cnjA.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (3f1354f) and merge commit (24247ba).

Test Logs

• Base (3f1354f): https://github.com/firebase/firebase-js-sdk/actions/runs/3323890617
• Merge (24247ba): https://github.com/firebase/firebase-js-sdk/actions/runs/3331354423

1. https://storage.googleapis.com/firebase-sdk-metric-reports/p9Ph5L2cwA.html

[egilmorez]

LGTM, thanks!

[hsubox76]

Just out of curiosity I looked to see if this package (@firebase/messaging-types) is being used anywhere and it doesn't seem to be? I see it as a dependency in packages/messaging/package.json but I don't see it imported anywhere in the source code. The other instances of [product]-types packages we have are legacy typings that are only used by [product]-compat but messaging-compat doesn't seem to use anything from it, and regular v9 messaging also doesn't. Maybe we could remove it? (in a later PR)