#6 add dt_as_mysftime() and as_mysftime() functions

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (e8bde46) 93.66% compared to head (3b0ce81) 93.77%. Report is 1 commits behind head on main.

Files	Patch %	Lines
R/manipulate_spacetime_data.R	98.07%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #12 +/- ## ========================================== + Coverage 93.66% 93.77% +0.11% ========================================== Files 6 6 Lines 2004 2056 +52 ========================================== + Hits 1877 1928 +51 - Misses 127 128 +1 ```

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