Metrics and updated logging for importer / exporter semaphores

[fin09pcap]

Problem Statement

When performing secret operations; the go routines for the workers would hide the errors raised during the operation(s).

Changes

The following changes are proposed.

1) Exporter and Importer Logging Enhancements

• Added operation timing, start/completion logs with metrics
• Implemented semaphore acquisition logging with detailed context error diagnostics
• Added producer/consumer progress tracking and rate metrics (paths/sec, processed counts)
• Implemented error classification (connection, permission, timeout) for Vault read failures
• Added context cancellation detection and early error reporting
• Fixed context error validation using errors.Is() instead of == equality checks
• Ensures proper detection of context.Canceled and context.DeadlineExceeded with wrapped errors

2) Test Coverage (importer_test.go)

• Added constructor validation tests
• Added bundle analysis tests for covering edge cases and metric calculations