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 #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

[emdneto]

should we handle #4644 first then? Like in two separate PRs or the proto bump depends on all the changes to be done together?

[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