feat(functions): Add task queue API support (#770)

* feat(functions): Add task queue API support (#751)

* Draft implementation of task queue

* fix lint

* Error handling, code review fixes and typos

* feat(functions): Add unit and integration tests for task queue api support (#764)

* Unit and Integration tests for task queues.

* fix: copyright year

* fix: remove commented code

* feat(functions): Added `uri` task option and additional task queue test coverage (#767)

* feat(functions): Add task queue API support (#751)

* Draft implementation of task queue

* fix lint

* Error handling, code review fixes and typos

* feat(functions): Add unit and integration tests for task queue api support (#764)

* Unit and Integration tests for task queues.

* fix: copyright year

* fix: remove commented code

* feat(functions): Added `uri` task option and additional task queue test coverage

* Removed uri and add doc strings

* fix removed typo

* re-add missing uri changes

* fix missing check

* fix: TW requested changes

* fix: Added extra note for full list of replaced headers and undo Content-Type change