Add lower-to-higher precision conversion in _convert_timestamp

[rwader-swi]

Closes #

Proposed Changes

Currently the _convert_timestamp util only supports higher precision to lower precision time conversion. Some of the usecases might need the opposite, and instead of writing on our own we wish to use this already present utility. In my usecase the data is in floating point as seconds which I might want to convert to nanoseconds or other precision. So did some small changes.

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• pytest tests completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)

[bednar]

This PR has been closed because it has not had recent activity. Please reopen if this PR is still important to you and you want to continue with them.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.42%. Comparing base (a645ea9) to head (0a8ea0b).
Report is 26 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #650   +/-   ##
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  Coverage   90.42%   90.42%           
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  Files          39       39           
  Lines        3509     3509           
=======================================
  Hits         3173     3173           
  Misses        336      336           

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