Enable ActionUuid for TypeScript

[wayneparrott]

While working with rclnodejs actions I found myself copy-paste code for working with UUIDs in client-side goals. Rather than repeat this pattern multiple times I decided to update and externalize the ActionUuid found in lib/action/uuid.js for general use.

Changes:

• Add action_uuid.d.ts - typings for ActionUuid
• Updated uuid.js - adds ROS2 UUID convenience methods
• Add test-action-uuid.js - tests for ActionUuid
• Update test-action-client.js - replaced internal uuid code with ActionUuid.
• Updated dtslint main.ts - added TypeScript type tests for ActionUuid

Fix #870

[wayneparrott]

If this PR is out of scope for this project I have an alt location with additional convenience support for rclnodejs actions here. I can host it there for a while and see how generally useful it is to others. So no pressure to accept!