Add a way to defer control of flushing to user

[billyvg]

Provide a method for the user to control when a replay is sent to Sentry. As an example, sending the replay only when a button is clicked.

This should function very similar to the "send on error" mode, except we provide an API to the user to send the replay instead of when we capture an exception.

Reference: getsentry/sentry#39460 (comment)

[github-actions]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

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"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[mydea]

See also #6537

[github-actions]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[billyvg]

Closing in favor of #7540