Eliminate MicrometerMetricsCaptor

[garyrussell]

Use Micrometer directly.

[smsufyian]

@garyrussell , I would like to work on this issue

[garyrussell]

Thanks for the offer but this is slated for a future release - 5.3 at the earliest. That's why it's on the backlog milestone, not 5.2.x.

[artembilan]

Some relevant work: #3357