Add support for Cloud Tasks

[bryanoltman]

Adds minimal Cloud Tasks support (creating a task with an http request).

I'm not sure if this is built out enough to warrant merging, and I imagine documentation updates would be required as well. lmk what you think!

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[github-actions]

Package publishing

Package	Version	Status	Publish tag (post-merge)
package:appengine	0.13.11	already published at pub.dev
package:gcloud	0.10.0	ready to publish	gcloud-v0.10.0
package:googleapis_firestore_v1	0.1.0-wip	WIP (no publish necessary)
package:native_synchronization	0.3.1	already published at pub.dev

Documentation at https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.

[devoncarew]

Thanks for the contribution! I made a few review comments, but don't have enough context to say whether this is an API we want (or what it should look like).

cc'ing @sigurdm and the @dart-lang/dart-pub-team generally for thoughts.

[devoncarew]

Can you add the std 3-line copyright header here? For 2025.

[devoncarew]

3-line copyright header

[devoncarew]

copyright header