feat(throttle): extend throttling to API requests

[david-leifker]

Ingestion Throttling Update

• Support API throttling for non-browser ingestion/write requests (Rest.li, OpenAPI, Graphql)
• Added Manual throttle for API requests
• Introduce system operations permission to control access to manual throttle
• RETRY_AFTER http header added for (OpenAPI, Graphql)
• API throttling is also using previously existing kafka throttle (MCL topics)

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub

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[david-leifker]

This does not handle the case with multiple GMS instances when MANUAL throttle is toggled. The kafka related throttling works fine since it monitors the same topic lag. However this PR should be updated so that the MANUAL throttle will work across GMS instances when multiple replicas are present.

[RyanHolstien]

Nice, this probably makes sense because it has higher frequency of updates and tighter latency constraints with a low memory footprint.