Migrate the Memory Inspector from Theia to its extension under cdt-cloud umbrella

The [Memory Inspector](https://github.com/eclipse-theia/theia-cpp-extensions/pull/119) is a very powerful UI delivering the best Memory View in the market today. However today it is tied to Theia and cannot be used in VSCode as an extension.

There have been preliminary discussions at the Embedded SIG about moving the memory inspector to its own extension that can be consumed by VSCode or Theia.

Interested parties in this work include ARM, Ericsson and Renesas. Specifically @colin-grant-work, @thegecko, @jonahgraham have shown interest in contributing to this work.

This issue is the umbrella to track making it its own extension. Once there is a git repo for the extension it is expected that this issue will be moved to that repo.