Interactions with other views

**Description**

It would be useful to add more places to invoke the Memory Inspector for easier discoverability and increased productivity. This could include opening the Memory Inspector from
- [x] Main/View menu (would be an empty window instance)
- [ ] Variable value, currently only from variable address
- [ ] Watch entry/expression
- [ ] ~~Register value in variables window, for example to show top of stack stored in a stack pointer~~ Not a must for this task collection. And could also become a more debug adapter specific solution. For example Arm Debugger and Arm Embedded Debugger extensions have a split out register window.

**Additional information**