* Add OpenTelemetry integration for workflow tracing
Introduced a new module, Elsa.OpenTelemetry, to provide OpenTelemetry sources for tracing workflow and activity execution. Updated various components and pipeline extensions to support OpenTelemetry tracing throughout the workflow execution process.
* Refactor workflow execution pipelines
Deleted `WorkflowsFeatureExtensions` and migrated methods to `PipelineWorkflowsFeatureExtensions` with added configurability. Enhanced `ActivityExecutionMiddlewareExtensions` and `ActivityExecutionPipelinePipelineBuilder` to support middleware insertion. Added comprehensive tracing to `OpenTelemetryTracingWorkflowExecutionMiddleware`.
* Add OpenTelemetry tracing to activity execution
Introduced `OpenTelemetryTracingActivityExecutionMiddleware` to capture tracing information for activity execution within workflows. This middleware logs activity execution start and end events, attaching pertinent activity tags. Added extension method to register this middleware in the workflow execution pipeline.
* Set `PYTHONNET_PYDLL` consistently and update workflow pipelines
Update Dockerfiles to set the `PYTHONNET_PYDLL` environment variable consistently without spaces. Additionally, refactor `Program.cs` to streamline workflow and activity execution pipeline configurations by using the `WithDefaultWorkflowExecutionPipeline` and `WithDefaultActivityExecutionPipeline` methods.
* Enhance OpenTelemetry Tracing Middleware Implementation
Add missing activity tags and events to improve telemetry data. Simplify middleware installation syntax for both workflow and activity execution tracing pipelines, ensuring consistent and clear tracing across modules.
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