Feature/bmauer/extdatadriver delay

[bena-nasa]

@tclune, thoughts on this, naming, style, etc...

Implemented a simple "mapl_sleep" function so as to avoid using the vendor "sleep", it takes a single integer argument in milliseconds (happy to change seconds etc...) and does what the name says, for that number of milliseconds. The extra bits are just in case this is called and crosses midnight.

Could not really thing of anything to add to this, not like there's any sort of error checking I can even think of to do here or even how one could add some sort of unit test for this since it is not as if there's something this returns one can check...

I did play overriding the intrinsic date_and_time so I could convince myself that indeed this would work when the system crosses midnight.

Wanted this so I could add the ability in ExtDataDriver.x to introduce a tilmestep latency for testing purposes and not use "sleep" given it is non-standard, which I also did in this branch

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Trivial change (affects only documentation or cleanup)

Checklist:

• I have tested this change with a run of GEOSgcm (if non-trivial)
• I have added one of the required labels (0 diff, 0 diff trivial, 0 diff structural, non 0-diff)
• I have updated the CHANGELOG.md accordingly following the style of Keep a Changelog