Stream: added metadata support

[Venoox]

Description

This adds ability to add metadata to videos.
Resolves #1062

Has your change been tested?

I've added the tests and also manually tested with Postman

Types of changes

What sort of change does your code introduce/modify?

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• This change is using publicly documented (api.cloudflare.com or developers.cloudflare.com) and stable APIs.

[github-actions]

changelog detected ✅

[jacobbednarz]

i'm not able to find this publicly documented; are you able to point me towards it?

[Venoox]

They said they will update their docs https://community.cloudflare.com/t/cloudflare-stream-api-reference-inconsistency/414137/4?u=venoox

[github-actions]

This functionality has been released in v0.69.0.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!