Allow for custom tab bar and nb toolbar item ids

[fcollonval]

Fixes #46

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[jtpio]

Thanks!

Regarding the whitespaces, maybe we could do a pass on the codebase to format all at once, and adopt prettier?

In the meantime we can check the diff for this PR without the whitespaces with: https://github.com/jupyterlab/galata/pull/48/files?diff=split&w=1

[fcollonval]

maybe we could do a pass on the codebase to format all at once, and adopt prettier?

I think prettier will make sense to be consistent with JLab.

... sorry I have turn on auto format on save so this brings noise when no linter is set like here.

[jtpio]

I think prettier will make sense to be consistent with JLab.

Maybe we can then do that together with #49 first.

[fcollonval]

This has been rebased.

[jtpio]

Thanks!

This should give more flexibility to third-party extension authors.

[fcollonval]

Small note: in VS Code the LS solves the type to simple string. Hence code hint is not showing the default value but simply type: string.

[jtpio]

Thanks!