WIP: AIRO-1243 Make Unity ROS Service Async

[sdiao]

Proposed change(s)

Describe the changes made in this PR.

Useful links (GitHub issues, JIRA tickets, forum threads, etc.)

Provide any relevant links here.

Types of change(s)

• Bug fix
• New feature
• Code refactor
• Documentation update
• Other (please describe)

Testing and Verification

Please describe the tests that you ran to verify your changes. Please also provide instructions, ROS packages, and Unity project files as appropriate so we can reproduce the test environment.

Test Configuration:

• Unity Version: [e.g. Unity 2020.2.0f1]
• Unity machine OS + version: [e.g. Windows 10]
• ROS machine OS + version: [e.g. Ubuntu 18.04, ROS Noetic]
• ROS–Unity communication: [e.g. Docker]

Checklist

• Ensured this PR is up-to-date with the dev branch
• Created this PR to target the dev branch
• Followed the style guidelines as described in the Contribution Guidelines
• Added tests that prove my fix is effective or that my feature works
• Updated the Changelog and described changes in the Unreleased section
• Updated the documentation as appropriate

Other comments

[at669]

tested with P&P and seems to work in conjunction with Endpoint laurie/NoMoreSourceDestinationDict branch!

[at669]

nit: redundant private specification

[at669]

should I be able to show a default or custom HUD window or visualizer for services? if i try to turn any of the above on for the MoverService, I get:

ROS side: [ERROR] [1632851615.610341]: Failed to resolve message name: 'module' object has no attribute 'MoverService'
Unity side: SysCommand.subscribe - Unknown message class 'niryo_moveit/MoverService'

Error when viewing services