feat: Add 'opentelemetry-exporter-otlp-json-http' package

[herin049]

Description

Follow up to #4996 and finishes the implementation of the OTLP JSON exporter.

Fixes #1003.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Tests have been added to the opentelemetry-exporter-otlp-json-http and opentelemetry-exporter-otlp-json-common packages, and the existing Docker tests have been completely rewritten to test gRPC, proto-HTTP and JSON-HTTP exporters with all signal types.

Does This PR Require a Contrib Repo Change?

• Yes. - Link to PR:
• No.

Checklist:

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

[MikeGoldsmith]

This is massive at over 9k lines. I'm generally not in favour of such large PRs as you can't approve with confidence.

Saying that, I did notice a couple of things we should look at.

[herin049]

This is massive at over 9k lines. I'm generally not in favour of such large PRs as you can't approve with confidence.

Saying that, I did notice a couple of things we should look at.

This PR will be dramatically smaller once the PR to add opentelemetry-exporter-otlp-json-common is merged. We can discuss breaking up the PR further if it still is too large once I rebase this PR.

[aabmass]

@herin049 is this ready for review or still stacked on another PR?

[herin049]

@herin049 is this ready for review or still stacked on another PR?

@aabmass It is ready for review, but it includes all the changes from #4996 which needs to be merged.

[MikeGoldsmith]

I'm gonna move this to draft until #4996 merges so it's clear it has a dependency before we can do a final review.