Feat/block replay time

[rob-stacks]

Description

This simple patch adds a new information to every transaction in the blockreplay/simulate api: execution_time_millis

It is the amount of wall-clock milliseconds required for executing the transaction. It is a simple fallback for those platform
without hardware profiler support.

Note: the patch fixes a bunch of error in the openapi schema

Applicable issues

• fixes #

Additional info (benefits, drawbacks, caveats)

Checklist

• Test coverage for new or modified code paths
• For new Clarity features or consensus changes, add property tests (see docs/property-testing.md)
• Changelog fragment(s) or "no changelog" label added (see changelog.d/README.md)
• Required documentation changes (e.g., rpc/openapi.yaml for RPC endpoints, event-dispatcher.md for new events)
• New clarity functions have corresponding PR in clarity-benchmarking repo