Observables dates (creation and modification) required seconds precision

[Fred-certeu]

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Problem to Solve

For openCTI entities the creation and modification date just indicate the date (not the time)
For most entities, this is acceptable.
But for observables (at least) a more precise timing info is needed : date + time (hh:mm:ss)
For example, when a connector will import large sets of observables everyday (typically every xx minutes), it becomes very useful to filter at the time level (not just the date).

Current Workaround

None

Proposed Solution

Implement time level information for observables : creation and modification time.

Additional Information

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