Directly implement Measure trait for metric aggregates

[fraillt]

Changes

At the moment aggregation implementations (Sum, LastValue, Histogram, etc...) doesn't implement any traits. But there's a Measure<T> trait is used to implement SyncInstrument.
At the moment there's a filter function AggregateBuilder, that makes implements Measure<T> for aggregations. The way it works is like this:

1. create Arc, which will be used to measure and collect on aggregation.
2. create closure that implements Measure<T>, which captures Arc for measurement
3. wraps it in another closure, that checks if attributes should be filtered (this check is for every single call to measure)
4. Finally create Arc<dyn Measure<T>.

In this revision aggregations directly implement Measure<T>, so things get a bit simpler:

• if there's no filtering then directly use same Arc<SpecificAggregation> (no need to wrap in closure, and then in another closure and then create Arc again)
• if there's filtering enabled, construct Arc<FilteredMeasureInstrument> which wraps Arc<SpecificAggregation> to do attribute filtering.

Technically this should be more performant (because if there's no filtering, then there's no need to have two closures and 1 extra Arc), but compiler is smart enough, so I didn't observed any increase in performance.
Regardless, in theory there's less work to be done, and also less code to understand :)

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[fraillt]

Any advice on naming?
both for maybe_filtered_measurement function, and for FilteredMeasureInstrument...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.5%. Comparing base (e0159ad) to head (00bee01).

Additional details and impacted files

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##            main   #2371     +/-   ##
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- Coverage   79.5%   79.5%   -0.1%     
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  Files        123     123             
  Lines      21492   21485      -7     
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- Hits       17094   17085      -9     
- Misses      4398    4400      +2     

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