[receiver/file] add capability to replay metrics in time

[pmcollins]

Description: This change adds the ability to replay metrics at the same rate that they were originally received. (I also have a change to update the timestamps to current values but left that out for now to keep the diff smaller.)

Link to tracking Issue: #14638

Testing: Unit tests pass.

Documentation: Updated README with new capability and config field.

[runforesight]

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TestMySqlIntegration ❌ failed 1 times in 3 runs (33% fail rate).

TestMySqlIntegration/Running_mysql_version_8.0 ❌ failed 1 times in 3 runs (33% fail rate).

build-and-test-windows duration(7 seconds) has decreased 35 minutes 41 seconds compared to main branch avg(35 minutes 48 seconds).

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✅  telemetrygen workflow has finished in 1 minute (45 seconds less than main branch avg.) and finished at 17th Mar, 2023.

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✅  build-and-test workflow has finished in 36 minutes 53 seconds (16 minutes 56 seconds less than main branch avg.) and finished at 18th Mar, 2023.

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⭕  build-and-test-windows workflow has finished in 7 seconds (35 minutes 41 seconds less than main branch avg.) and finished at 23rd Mar, 2023.

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[pmcollins]

I'm open to suggestions on this name.

[atoulme]

maybe playback speed, similar to what youtube does?

[pmcollins]

Yeah, this is what I went with originally but I wanted to be able to let users turn off replay timings completely without having to introduce a new config parameter -- they can do so by just setting throttle to 0. Would a playback_speed + some other config parameter to turn off timings be better?

[atoulme]

LGTM!