OM2 - CompositeValue + start timestamp + exemplar compliance

compositeValues:
- Histogram as single line: foo {count:17,sum:324789.3,bucket:[0.1:8,0.25:10,0.5:11,1.0:14,+Inf:17]} 1.0 st@0.5
- Summary as single line: bar {count:17,sum:324789.3,quantile:[0.95:123.7,0.99:150.0]}
- GaugeHistogram as single line with count/sum (not gcount/gsum)
- _created lines replaced by inline st@ start timestamp
- _count, _sum, _bucket suffixed lines no longer emitted for these types
- Reserved label prefix changed from _ to __
- Histogram/GaugeHistogram Count and Sum always present (MUST, was SHOULD for Sum)
- Histogram bucket values may be float (SHOULD be integer, was MUST)
- Spec: CompositeValue, Histogram, Summary
exemplarCompliance:
- Exemplar timestamps always emitted (OM2: MUST, was MAY in OM1)
- 128-char LabelSet hard limit removed

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