Make menubar its own widget and add overflow

[sbatten]

MenubarControl has been broken into 2 pieces:

1. a widget that controls display and interaction and
2. a control that handles the model and vs code settings changes

This made it very easy to add a the overflow logic as part of the widget

resolves #57756

[sbatten]

Should probably not use More, but rather triple dot icon

[bpasero]

Given the amount of changes, I did not do a code review. I like the direction though, especially making the menubarControl.ts in workbench slimmer.

Playing around with it (on Linux): I agree we could use a "..." similar to this one:

Though I was actually not opposed to the "More" either.

PS: wow, windows seems to wrap actually (not my preference):

[bpasero]

@sbatten there seems to be an issue with the direction of where the menu opens in this case:

Since space is typically limited to the right when "More" shows up I believe you need to show the menu then to the left to account for the narrow size, otherwise a user will probably have issues accessing all menu entries from the "More" menu.

[sbatten]

@bpasero thanks for the review, you can see quite a few changes since your approval.

• Using ellipsis
• Compact menus that cascade when needed. The drawing to the left didn't help in most cases, because a lot of the time you only have room for 1.5 menus when testing this
• Mnemonics fixed when in overflow

[bpasero]

@sbatten looks good to me. if you want to merge it for Nov, it should get a good test plan item.