util: enhance sleep_for function to support double milliseconds

[deanlee]

updates the sleep_for function to accept a double parameter, enabling support for fractional milliseconds and allowing for more precise timing control.

Note:
The RateKeeper requires double precision for accurate timing. By updating the sleep_for function, we align with the precision needs of the RateKeeper implementation, ensuring that the timing calculations are as accurate as possible:

openpilot/common/ratekeeper.cc

Lines 17 to 23 in 7248b00

	bool RateKeeper::keepTime() {
	bool lagged = monitorTime();
	if (remaining_ > 0) {
	util::sleep_for(remaining_ * 1000);
	}
	return lagged;
	}

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