[receiver/mongodbatlas] Add Events API Support

[schmikei]

Description: Added support for collecting Events from the MongoDB Atlas API

Sample Configuration

mongodbatlas:
  public_key: "my-public-key"
  private_key: "my-private-key"
  events:
   projects:
      - name: Project 0
    poll_interval: 1m
    types: [ALERT_CONFIG_CHANGED_AUDIT]
    page_size: 100
    max_pages: 25

Link to tracking Issue: Resolves #18061

Testing: Unit Testing

Documentation: Added more information on configuration to the README

[runforesight]

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build-and-test-windows duration(3 seconds) has decreased 40 minutes 12 seconds compared to main branch avg(40 minutes 15 seconds).

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⭕  build-and-test-windows workflow has finished in 3 seconds (40 minutes 12 seconds less than main branch avg.) and finished at 3rd Feb, 2023.

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✅  build-and-test workflow has finished in 42 minutes 43 seconds (10 minutes 13 seconds less than main branch avg.) and finished at 3rd Feb, 2023.

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unittest-matrix (1.19, internal)	-     🔗	✅ 561  ❌ 0  ⏭ 0    🔗	See Details
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✅  load-tests workflow has finished in 8 minutes 10 seconds (6 minutes 21 seconds less than main branch avg.) and finished at 3rd Feb, 2023.

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[schmikei]

@djaglowski here's my first stab at implementing this based off your guys' feedback in #18237, happy to iterate on the solution as well or add more specific tests!

[djaglowski]

Forgot to submit a couple comments. Hopefully easy ones

[djaglowski]

You don't appear to be using this anywhere.

[djaglowski]

I'm not sure you actually need the mutex. Each instance of the receiver will have its own instance of NextStartTime. Within each instance of the receiver, you only access NextStartTime synchronously within each poll, and each poll blocks the next.

[schmikei]

Ahh you're right I'll remove it 👍 was concerned about the goroutine nature of it but you're right it doesn't need it