Feature request: recording option to capture callstacks for all markers

[acreskeyMoz]

It would be helpful for engineers to be able to capture callstacks for all existing markers without having to modify the source code for each marker.

Similar to how the profilerstacks options for MOZ_LOGs allows the developer to capture callstacks without having to recompile.

┆Issue is synchronized with this Jira Task

[acreskeyMoz]

Earlier, related request from @fqueze

| florian Would it make sense to have an environment variable containing a list of marker names for which stacks should be captured even when MarkerStack::Capture() isn't in the marker options? I think that would help me debug some tests faster without rebuilding