feat: allow sendEvent to update an existing event

[hmacr]

Closes #604

✅ Checklist

• I have followed every step in the contributing guide
• The PR title follows the convention.
• I ran and tested the code works

---

Testing

• Verified event creation and subsequent run.
  • without deliverAt / deliverAfter.
  • with deliverAt / deliverAfter.
• Verified event updation and subsequent run.
  • without deliverAt / deliverAfter.
  • with deliverAt / deliverAfter.
• Verified event doesn't get updated when it is within the threshold window.

---

Changelog

• Implement event update for duplicate requests.
• Use a threshold window to determine if the update should proceed.

💯

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Latest commit: a93e1b8

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[ericallam]

@hmacr great work on this 👏. If you are interested could you take a look at this issue: #604

[hmacr]

@hmacr great work on this 👏. If you are interested could you take a look at this issue: #604

@ericallam The issue referenced, points to the one that's resolved by this PR. Did you mean to link a different issue?

[ericallam]

@hmacr oops, I meant to link to this one: #565

[hmacr]

@hmacr oops, I meant to link to this one: #565

@ericallam Sure! I'll have a look 👍