Mark Snapshot Profiler configuration as Experimental

[pellared]

Follows #362

So that we have a chance to double-check when stabilizing the feature.

If this is indeed stable then changes like #358 should not be allowed. If this is a bugfix then it should be at least mentioned in the changelog as a bugfix. However, I think it is questionable if this was a bug. Note that e.g. parentbased_traceidratio accepts 0 as a valid value (reference: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#general-sdk-configuration).

[pellared]

@breedx-splk, @seemk , PTAL

[seemk]

I think #358 should be reverted, zero probability makes sense. 🤔 Approved it too hastily

[pellared]

I think #358 should be reverted, zero probability makes sense. 🤔 Approved it too hastily

@seemk, do I understand correctly that you just prefer to revert #358 and keep this section Stable (as you have not approved this PR 😉 )?

[Kielek]

Closing in favor of #366

[pellared]

Closing in favor of #366

These are not exclusive PRs.

Note that both @seemk and @lachmatt have approved this PR.

I would like to have confirmation from @breedx-splk, @seemk, and @lachmatt that these env vars can be stabilized.
It is easier to do it via PRs. Then we also have a history in GitHub.

Moreover, these env vars are not even described in the changelog.