opentelemetry v1.4.0 & v0.23b0

Added

• opentelemetry-semantic-conventions Generate semconv constants update for OTel Spec 1.5.0 (#1946)
• Moved opentelemetry-instrumentation to core repository. (#1959)
• Dropped attributes/events/links count available exposed on ReadableSpans. (#1893)
• Added dropped count to otlp, jaeger and zipkin exporters. (#1893)

Changed

• Updated opentelemetry-opencensus-exporter to use service_name of spans instead of resource (#1897)
• Added descriptions to the env variables mentioned in the opentelemetry-specification (#1898)
• Ignore calls to Span.set_status with StatusCode.UNSET and also if previous status already had StatusCode.OK. (#1902)
• Attributes for Link and Resource are immutable as they are for Event, which means any attempt to modify attributes directly will result in a TypeError exception. (#1909)
• Added BoundedAttributes to the API to make it available for Link which is defined in the API. Marked BoundedDict in the SDK as deprecated as a result. (#1915)
• Fix OTLP SpanExporter to distinguish spans based off Resource and InstrumentationInfo (#1927)
• Updating dependency for opentelemetry api/sdk packages to support major version instead of pinning to specific versions. (#1933)

Fixed

• Updated opentelementry-opentracing-shim ScopeShim to report exceptions in opentelemetry specification format, rather than opentracing spec format. (#1878)