Add Exception handling in Agenta Observability

[jp-agenta]

Is your feature request related to a problem? Please describe.
Exceptions are currently not handled as per OpenTelemetry specifications.

Describe the solution you'd like
This feature would require changes in the SDK (for instance self.tracing.add_event() and self.tracing.record_exception(), at least, if the solution uses Events as per OTel specs), as well as changes in the UI to handle events (again, if the solution uses Events). Also, Exceptions would not be part of the trace outputsanymore.

Describe alternatives you've considered

1. Implementing Events (proper solution but with more moving parts)
2. Adding exceptions as another span attribute (non-standard solution but with fewer moving parts)

Additional context
https://github.com/open-telemetry/opentelemetry-specification/blob/v1.33.0/specification/trace/api.md
https://github.com/open-telemetry/opentelemetry-specification/blob/v1.33.0/specification/trace/exceptions.md
https://opentelemetry.io/docs/specs/semconv/exceptions/exceptions-spans/
https://opentelemetry.io/docs/concepts/signals/traces/

[jp-agenta]

Related to AGE-389