User Story (Required on creation):

I want to be able to easily set transient variables via an API in the External Task Client JavaScript.

Functional Requirements (Required before implementation):

There is a function that allows to set a transient variable via name and value.

Technical Requirements (Required before implementation):

Limitations of Scope (Optional):

Hints (optional):

Created on behalf of https://github.com/camunda/camunda-external-task-client-js/pull/244