OpenTelemetry Specification 1.34.0 Release Epic

[bobstrecansky]

The OpenTelemetry Specification Release 1.34.0 happened yesterday:
https://github.com/open-telemetry/opentelemetry-specification/releases/tag/v1.34.0

We need to add in the changes from the specification to our repository. Subsequent issues are listed below for each of them, this issue is just be a meta placeholder for all of the issues created.

• OpenTelemetry Specification 1.34.0 Release - Traces - Clarify the trace SDK should log discarded events and links #1323
• OpenTelemetry Specification 1.34.0 Release - Traces - Add new in-development Enabled API to the Tracer #1324
• OpenTelemetry Specification 1.34.0 Release - Metrics - Add new in-development Enabled API to the Tracer #1325
• OpenTelemetry Specification 1.34.0 Release - Logs - Add the in-development Enabled API to the Logger #1326
• OpenTelemetry Specification 1.34.0 Release - Events - Rename event payload to body #1327
• OpenTelemetry Specification 1.34.0 Release - Events - Add specification for EventLogger and EventLoggerProvider #1328
• OpenTelemetry Specification 1.34.0 Release - Events - Describe the use cases for events in greater detail #1329
• OpenTelemetry Specification 1.34.0 Release - Compatibility - Prometheus: Clarify location of unit suffix within metric names #1330
• OpenTelemetry Specification 1.34.0 Release - Common - OpenTelemetry clients MUST follow SemVer 2.0.0. #1331
• OpenTelemetry Specification 1.34.0 Release - Common - Rename "Experimental" to "Development" according to OTEP 0232 #1332
• OpenTelemetry Specification 1.34.0 Release - Supplementary Guidelines - Clarify that it is permissible to extend SDK interfaces without requiring a major version bump #1333