feat(otel): Add OpenTelemetry plugin module with deterministic tracing

[ayushiahjolia]

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Issue Link, if available

#333

Description

Add OpenTelemetry plugin module for durable execution tracing.

Changes

New otel-plugin Maven module providing a DurableExecutionPlugin implementation that emits OTel spans for durable execution lifecycle events.

What's covered in this PR -

• All invocations of the same execution share a single deterministic trace ID
• Operation spans are opened when operations start and closed when they complete or the invocation ends
• Attempt spans wrap user code execution with Context.makeCurrent() so auto-instrumented AWS SDK calls nest correctly
• X-Ray trace context extracted from Lambda environment and used as parent for invocation spans
• Deterministic sampling ensures consistent trace/no-trace decision across all invocations of the same execution
• SLF4J MDC enriched with trace_id, span_id, and execution ARN during user code execution for log-trace correlation
• Spans include attributes: execution ARN, operation ID, type, subtype, name, parent ID, attempt number, outcome
• forceFlush called before Lambda freezes to ensure spans are exported
• Plugin errors isolated, never disrupt SDK execution

Not covered in this PR -

• Spans for virtual contexts
• Duplicate onOperationStart during replay

Usage

var idGenerator = new DeterministicIdGenerator();
var tracerProvider = SdkTracerProvider.builder()
    .setIdGenerator(idGenerator)
    .addSpanProcessor(SimpleSpanProcessor.create(exporter))
    .build();

@Override
protected DurableConfig createConfiguration() {
    return DurableConfig.builder()
        .withPlugins(new OpenTelemetryDurablePlugin(tracerProvider, idGenerator))
        .build();
}

Demo/Screenshots

Checklist

• I have filled out every section of the PR template
• I have thoroughly tested this change

Testing

Unit Tests

Have unit tests been written for these changes? Yes

Integration Tests

Have integration tests been written for these changes? Yes

Examples

Has a new example been added for the change? (if applicable) Yes