Update configs to match gdi-spec changes

[breedx-splk]

Aligns with #353 in gdi-spec.
This should be considered a breaking change for any users currently using snapshots.

[laurit]

would it also make sense to change the stack depth property and other properties that start with splunk.snapshot.profiler?

[robsunday]

Or actually prefix everything with splunk.profiler.snapshot. , since snapshots are part of profiler. This would also create more logical composition of properties in declarative config yaml. Something like:

instrumentation/development:
  java:  
    splunk:
      profiler:
        enabled: true #splunk.profiler.enabled (default: false)
        directory: #splunk.profiler.directory (default: system specific temp dir)

        snapshot:
          enabled: true
          export:
            interval: 10000
          sampling:
            interval: 5000
          selection:
            probability: 0.025
          staging:
            capacity: 100
          max:
            stack:
              depth: 1000

[breedx-splk]

would it also make sense to change the stack depth property and other properties that start with splunk.snapshot.profiler?

Maybe, but that's out of scope right now. I only wanted to align the 3 main ones for now.

[breedx-splk]

Or actually prefix everything with splunk.profiler.snapshot. , since snapshots are part of profiler.

This is a step backwards. If you feel strongly about this, then please open an issue in gdi-specification. I think shorter is better than longer, and shallower is better than deeper...but let's not argue about that in this PR please.