Remove metrics quantiles

[jtescher]

Quantiles did not end up being part of the current metrics spec

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@1cdf725). Click here to learn what that means.
The diff coverage is n/a.

@@          Coverage Diff           @@
##             main    #525   +/-   ##
======================================
  Coverage        ?   51.1%           
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  Files           ?      95           
  Lines           ?    8395           
  Branches        ?       0           
======================================
  Hits            ?    4296           
  Misses          ?    4099           
  Partials        ?       0           

Impacted Files	Coverage Δ
...pentelemetry/src/sdk/export/metrics/aggregation.rs	0.0% <ø> (ø)
opentelemetry/src/sdk/export/metrics/mod.rs	0.0% <ø> (ø)
opentelemetry/src/sdk/export/metrics/stdout.rs	0.0% <ø> (ø)
opentelemetry/src/sdk/metrics/aggregators/array.rs	0.0% <ø> (ø)
...ntelemetry/src/sdk/metrics/aggregators/ddsketch.rs	76.2% <ø> (ø)

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[djc]

Can hardly say no to +21/-337!

[xnorpx]

@djc @jtescher what is the recommendation to get quantiles with this removed?