Deprecate jaeger exporters

[jack-berg]

The jaeger exporters are now deprecated in the specification, for removal in July 2023.

We should deprecate the java jaeger exporters

• opentelemetry-exporter-jaeger
• opentelemetry-exporter-jaeger-thift

This blog post explains the reasoning, but TL;DR is that jaeger supports native OTLP ingest, and jaeger has deprecated its client libraries and recommends switching to OpenTelemetry. Deprecating and removing the opentelemetry java jaeger exporter reduces confusion for users.

I recommend we deprecate soon so we can have a long deprecation cycle before removal (i.e. stop publishing new artifacts) in July 2023.