Enable persistence telemetry

[jakduch]

Summary

• load the existing persistence telemetry instrumentation
• prepend the instrumentation module to the correct persistence class
• cover all current persistence operations and remove duplicate entries
• add a regression test that verifies persistence calls emit the registered metric

Testing

• bundle exec ruby -Itest test/persistence_telemetry_test.rb
• bundle exec rubocop lib/dynflow.rb lib/dynflow/debug/telemetry/persistence.rb test/persistence_telemetry_test.rb
• full Ruby 3.3 / SQLite test suite: 403 runs, 1490 assertions, 0 failures, 0 errors

Fixes #463