Be able to model with DMN decision table open

[philippfromme]

Problem you would like to solve

Building a model can involve a lot of back and forth between the DRD editor and the decision table editor since the DRD view with a decision table open is read-only.

Proposed solution

Instead of making the DRD view read-only allow users to model with a decision table open.

Alternatives considered

None.

Additional context

Slack thread: https://camunda.slack.com/archives/C0693F1NFK5/p1721998683872429

[barmac]

I am moving this to the backlog as we are not tackling this immediately. I think in general it may make sense to have boxed expression (decision table, literal expression) as part of the viewer and not as a separate view. This could enable such features like a shared command stack. But it's not trivial to implement, and needs to be planned carefully.

CC @crobbins215 as it's rather not something we implement as a side task.