* Improve tests for OpenCensus metric conversions.
- Move metric conversion into its own utility (outside exporter)
- Add a series of tests for all open-census types.
- Update conversion code to work for ALL features of OTel metrics and
OpenCensus metrics. Notes:
- OC exemplars have wonky trace-attachments. Using crazy "no binary"
workaround.
- OC has gauge histogram. Encoding as DELTA with same start/stop
timestamp as closest OTEL equivalent
- OC has summaries, so we'll need to keep that data type around for
compatibility, unless we can tackle the raw measurements and push
them into Histograms.
* Create new mechanism to attach OpenCensus metrics to OpenTelemetry that's more amenable to autoconfiguring.
* Fix interoperability test failures.
* Fix style issue.
* Force tests to be in different JVM instnaces to account for OpenCEnsus global pollution.
* Bump timeout for disruptor queue in tests, for now.
* Fix up old interoperability tests and move them to their own file.
* Fix import wonkyness
* Move to Awaitility
* Fixes from review.
* Move MetricAdapter to internal package.
* Fix test against finding span-context in exemplars.
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