Validate feasibility of supporting new attribute types #7621
Description
What
Investigate whether it is possible and acceptable to extend the OTel Java API and SDK with new attribute types.
Guidelines for evolving API/SDK: https://github.com/open-telemetry/opentelemetry-specification/blob/main/oteps/4485-extending-attributes-to-support-complex-values.md#how
Prototype in OTel Go demonstrating feasibility of adding new attribute types: open-telemetry/opentelemetry-go#6809
Why
Per open-telemetry/opentelemetry-specification#4602
Follows open-telemetry/opentelemetry-specification#4614
The goal is to make sure that PRs like these are acceptable for OTel Java: