[chore] Add in Attribute Bundle pages #2382

[thompson-tomo]

Progresses #2382

Changes

Adds in a log record registry to enable easy discovery of log record definitions

Note: if the PR is touching an area that is not listed in the existing areas, or the area does not have sufficient domain experts coverage, the PR might be tagged as experts needed and move slowly until experts are identified.

Merge requirement checklist

• CONTRIBUTING.md guidelines followed.
• Change log entry added, according to the guidelines in When to add a changelog entry.
  • If your PR does not need a change log, start the PR title with [chore]
• schema-next.yaml updated with changes to existing conventions.

[thompson-tomo]

Currently blocked by #2471 after which build should be resolved.

[jsuereth]

Commented on the Event registry - We don't want logs vs. records split in semconv. Let's drop this PR and update the Event PR to include all event group types.

[thompson-tomo]

As per the filter these are looking at attribute groups rather than events.

What we do need is a way to capture a group/bundle of attributes which can be attached to log records, events or spans.

If we take the example of https://opentelemetry.io/docs/specs/semconv/cloudevents/cloudevents-spans/ that documentation is not a span but rather a grouping of attributes which could be added to a signal.

Let me rework this tomorrow.