feat(storage): add file metadata during upload

[robingenz]

Plugin(s)

• Analytics
• App
• App Check
• Authentication
• Crashlytics
• Cloud Firestore
• Cloud Messaging
• Cloud Storage
• Performance
• Remote Config

Current problem

It is currently not possible to add file metadata during upload. It is only possible to call the updateMetadata(...) method after the upload.

Preferred solution

It should be possible to add metadata during the upload of a file, see https://firebase.google.com/docs/storage/web/upload-files#add_file_metadata.
This should be supported on Android, iOS and Web.

Alternative options

No response

Additional context

I am setting a bounty of $50 on this issue.

The base branch to be used is feat/issue-506. This branch already contains the necessary type definitions (see #514).

Before submitting

• I have read and followed the feature request guidelines.
• I have attached links to possibly related issues and discussions.

[triyam]

/attempt #506

[triyam]

I recommend to make the changes in the definitions.ts file first and let me review them before starting with the actual implementation.

As you have told, let me know should I move ahead.

I am new open-source, any mistake correction or guidance will be a great help

[robingenz]

@triyam See #505 (comment)

The bounty is still available.