Variables to retrieve text in breadcrumbs and/or sticky scroll (current function, etc)

[RainBawZ]

It would be great having the ability to display elements from breadcrumbs or sticky scroll in the RPC details.

[nick22985]

Implementation of getting symbols via the vscode api here: https://github.com/cunneen/vscode-copy-breadcrumbs/blob/1ffcb7760523a413cce11f476e24f4b32e7be491/src/extension.ts#L103-L122