Instrument middleware to emit OTel metrics

[spompea-cfa]

Add OTel metrics:

• new otel.py module added
• Consumer: Senzing add_record -- counter, duration metrics
• Redoer: Senzing process_redo_record -- counter, duration metrics
• Redoer: Senzing's redo queue size -- gauge metric
• Exporter: export + write to S3 bucket (treated together as atomic) -- counter, duration metrics
• Add pip call to middleware Dockerfiles for OTel libs

Ancillary:

• Tweak init-db section of docker-compose for stability

[Copilot]

Pull Request Overview

This PR adds OpenTelemetry (OTel) instrumentation to the consumer, redoer, and exporter services to track metrics for message processing, export operations, and queue counts. The changes also include a minor Docker Compose fix for service health checks.

• Added OTel metrics collection with configurable exporters (Console or OTLP)
• Instrumented three middleware services to track operation counts, durations, and status
• Added environment variable support for runtime environment identification

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
middleware/otel.py	New module providing OTel initialization and common constants for status tracking
middleware/redoer.py	Added OTel metrics for redo message processing and queue monitoring
middleware/exporter.py	Added OTel metrics for export operation tracking
middleware/consumer.py	Added OTel metrics for consumer message processing
Dockerfile.redoer	Installed OpenTelemetry packages
Dockerfile.exporter	Installed OpenTelemetry packages
Dockerfile.consumer	Installed OpenTelemetry packages and enabled logging auto-instrumentation
docker-compose.yaml	Fixed depends_on syntax to use health check condition
README.md	Documented new OTel environment variables

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[jamesiarmes]

Overall looks sound. Copilot found a few small things, please address before merging.