rework existing message display in order to account for new message format

[felixhaeberle]

Description
The new message format is now accessible with the SDK v2, making message variants available. This leads to Sherlock user have to get introduced to the new format, by not hurting their existing workflow e.g. Bundle editor vs Inline Editing.

The crucial part is that we have several places where we display data (Inline, Context Tooltip, Message Tab & future Bundle Editor) which should ideally all be updated to the new format.

Proposal
As its a lot more difficult to display the new format "inline-ish" now, we have to find a way to replace the more advanced use cases of messages with the bundle editor.
Therefore, together with @nils.jacobsen – we will come up with a new/fitting way on how to approach this challenge.

The idea & likely approach we will take is that we enable inline editing for messages who do make heavy use of the new formats functionalities while giving the user the bundle editor when working with more advanced message structures.