Add cd and command args to create terminal command

[fcollonval]

References

Fix #7604

Code changes

Add arguments cd and command to the terminal:create-new command to optionally change the current directory of the terminal and execute a command in it.

User-facing changes

None

Backwards-incompatible changes

None

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[ian-r-rose]

@fcollonval A very similar functionality was removed in #5916 for security reasons. Commands are deliberately meant to be serialized as JSON and can be distributed, e.g., what we do in state restoration and workspaces. So the rationale in that PR was that allowing arbitrary code execution in command args could result in malicious code being distributed via command args in workspace files.

Note that initialCommand is still a constructor arg for the terminal widget, so extension authors can still use it. It's just currently not available as a command arg.

[fcollonval]

Thanks @ian-r-rose and sorry to miss the mentioned PR. So I open an issue on @jupyterlab/git to do the same.