manually trigger file sync in `odo dev`

[kadel]

User Story

• As an odo user running odo dev --no-watch
• I want to be able to trigger push and restart on demand
• So that I can trigger push only after I made multiple edits, because I don't need to see every single small change and on a complex application it can be expensive to trigger rebuild

Acceptance Criteria

1. This issue

• [ ] when odo dev is running user should be able to trigger push by pressing a key (p).
• [ ] odo dev output should inform user about this option
• [ ] triggering push on-demand should be possible regardless if odo dev is running with or without --no-watch

2. How to trigger the file sync https://github.com/redhat-developer/odo/issues/5986

/kind user-story

[valaparthvi]

question exclamation there should be a way to trigger sync "from the outside" (for example by sending signal to odo dev process (what about Windows?), or running new odo command in another terminal for example odo dev --push)

Use sockets to communicate with already running odo dev --no-watch instance.(Dharmit) Let user(adapters team) specify which port to use for odo dev, so that it becomes easier to communicate.(Tomas) Or create an API to communicate with odo to trigger it.(Tomas) We could use signals, but it would be a problem for Windows machines.

[valaparthvi]

I want to be able to trigger push and restart on demand

Do what odo dev does, but with manual trigger.

[valaparthvi]

Thoughts on integration tests?(Armel) https://github.com/micmonay/keybd_event could be used.

[cdrage]

I've managed to get a POC done with https://github.com/cdrage/odo/tree/manual-sync

So I'll take this up! Was actually quite straight-forward to implement.

[rm3l]

Integration tests remain to complete.

Estimation for remaining tasks: 2