Add bar_build_delay to data engine config

[faysou]

Pull Request

NautilusTrader prioritizes correctness and reliability, please follow existing patterns for validation and testing.

Summary

• Add bar_build_delay as params for SubscribeBars and request_aggregated_bars
  Set through data engine config
  Can be useful in a live context to account for network delays.
  Can be useful in a backtest context when aggregating interal bars (themselves aggregated).

Allows a delay when aggregating bars to ensure they are received.
Refactors existing code to allow this.

Set through data engine config
subscribe_bars has a default value of 0
request_aggregated_bars has a default value of 15 and used only when aggregating bars from internal bars (INTERNAL@INTERNAL)

• Also rename of time_bars_origin to time_bars_origin_offset

Related Issues/PRs

Type of change

• New feature (non-breaking)

Breaking change details (if applicable)

Release notes

• I added a concise entry to RELEASES.md that follows the existing conventions (when applicable)

Testing

Ensure new or changed logic is covered by tests.

• Affected code paths are already covered by the test suite
• I added/updated tests to cover new or changed logic