[SCM] Fix SCM status bar commands

[vinokurig]

What it does

Pass command arguments to SCM status bar commands. Map command.id to command.command in statusBarCommands and acceptInputCommand

How to test

1. Clone the test plugin: https://github.com/vinokurig/Test.git
2. Compile the plugin and start it as a hosted instance.
3. Select the / SCM repository (this is a view of a dummy SCM repository):
   
4. Click title button in the status bar:
   

See the notification

fixes eclipse-che/che#13974

Review checklist

• as an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• as a reviewer, I agree to behave in accordance with the review guidelines

[akosyakov]

Works very well, thank you!