feat: add upload cred to client []

[2wce]

Summary

Adding types and helper method for the new upload credentials on the upload api.

Description

This is required so we have a unified way of making these calls on staging & production. An authorised user can create an upload credential which is then used to upload a file to filestack

Checklist (check all before merging)

• Both unit and integration tests are passing
• There are no breaking changes
• Changes are reflected in the documentation

When adding a new method:

• The new method is exported through the default and plain CMA client
• All new public types are exported from ./lib/export-types.ts
• Added a unit test for the new method
• Added an integration test for the new method
• The new method is added to the documentation

[contentful-automation]

🎉 This PR is included in version 11.37.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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