Upgrade OTLP proto to v1.7. Add `event_name` to `LogRecord` API/SDK/PROTO

[DylanRussell]

Description

Upgrade to proto 1.7. The file diffs make it very hard to tell what has actually changed. Wish there were a better way to see actual diffs.

From reading through https://github.com/open-telemetry/opentelemetry-proto/releases -- most of the changes are to profiling which we don't support AFAICT, so I don't think we have to worry about that at all.

The only other notable change is that the EventName field was added to the LogRecord proto... I opened up https://github.com/open-telemetry/opentelemetry-python/issues/4644 for that.

Type of change

Please delete options that are not relevant.

• [x ] Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Unit tests

Does This PR Require a Contrib Repo Change?

• [ ] Yes. - Link to PR:
• [x ] No.

Checklist:

• [ x] Followed the style guidelines of this project
• [ x] Changelogs have been updated
• [ x] Unit tests have been added
• [x ] Documentation has been updated

[DylanRussell]

Hmm we could do it separately.. Proto change doesn't require it. I'm heading out for weekend but can break it out on Monday if you think that's cleaner

[DylanRussell]

Ok I backed off the changes adding support for event name

[DylanRussell]

Once this is submitted I'll make a new PR for those

[DylanRussell]

Created https://github.com/open-telemetry/opentelemetry-python/pull/4652 to add the field to the LogRecord