chore(deps): Migrate from OpenCensus to OpenTelemetry

[jsoriano]

Description

Migrate from OpenCensus to OpenTelemetry, doing some adjustements where there is no 1:1 migration path:

• zpages handler explicitly added to http.DefaultServeMux, as zpages.Handle() is not available anymore.
• Annotations replaced by Attributes.

I am also adjusting some uses of spans in compactions, so their annotations are not overwritten on every call to runCompactDef in cases where it is called multiple times.

Not using latest version of OpenTelemetry because it requires Go 1.22, and badger still supports 1.21.

Fix #2155.

Checklist

• Code compiles correctly and linting passes locally
• For all code changes, an entry added to the CHANGELOG.md file describing and linking to
  this PR
• Tests added for new functionality, or regression tests for bug fixes added as applicable
• For public APIs, new features, etc., PR on docs repo staged and linked here

[jsoriano]

Not sure how to address the issue with protobuf, could it be that protoc has a different version in CI? 🤔

[mauri870]

About the Go version, I see #2125 downgraded it from 1.23 to 1.21. Even if the repo goes with the last N-2 versions as opposed to the Go release policy of N-1 that would still be valid to bump it to 1.22 now. Let's wait for a maintainer's input on this.

[mangalaman93]

We have upgraded the Min Go version to 1.22 here #2171. Please upgrade the opentelemetry to the latest and we would be happy to merge the PR. Thank you for creating the PR.

[jsoriano]

OTel dependencies upgraded.

[mangalaman93]

Minor spelling mistake! LGTM otherwise. @harshil-goel for final review before merge.

[mangalaman93]

two more comments, we are good to merge otherwise! And resolve the conflicts as well. Thank you.