Extension API: Event when text editor is moved to another position/group

[jpoon]

vscodevim requires a unique ID for each editor. We are currently generating this ID based off of the document's filename and position (ie. viewColumn). However, we'd need to keep this ID up-to-date as the user moves the document to a new position.

As per @bpasero in #51001 (comment), the existing onDidChangeTextEditorViewColumn event only fires when:

* you move the group (containing all editors) to another position in the grid
* you close a group and as a result the position of other groups changes (e.g. close a group to the left of the current one)

We do not fire an event if you drag a single editor tab out of a group into another group. But this behaviour is totally unrelated to us moving to a grid model, it has always been like that for the reasons I mentioned earlier.

What I am requesting is an event that an extension can register on to be notified anytime an editor changes position in the grid.

[jrieken]

/duplicate of #15178

[vscodebot]

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