Merge the dotnet_* collectors

[carlpett]

Currently there are 8 dotnet collectors. I believe it would be better to merge these into a single collector, and make it possible to enable/disable "sub-collectors" much like the mssql collector does.

We'll need to consider how we handle the deprecation. I suggest that we handle the translation to the new flag and print a warning for a few versions before dropping the old collector names. For example, having the old flag --collectors.enabled=dotnet_clrjit would have the same effect as --collectors.enabled=dotnet --collector.dotnet.classes-enabled=dotnet (or whatever the flag would be named).
We also need to decide what would be the default sub-collectors. All of them?

[github-actions]

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