Non ptp epoch restriction

[samuelbray32]

Resolves #80

• When matching trodes timestamps from position tracking and rec file, first restrict the rec trodes timestamps to those corresponding to a rec system clock time within the epoch
• Enables accurate mapping when trodes timestamps are not uniques across epochs, but are unique within the epoch
• Gives minor speed and efficiency improvements
• Added documentation for get_position_timestamps()

[codecov[bot]]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (8a907f4) 90.70% compared to head (d6ec5be) 90.56%.

:exclamation: Current head d6ec5be differs from pull request most recent head 5cc0485. Consider uploading reports for the commit 5cc0485 to get more accurate results

Files	Patch %	Lines
src/trodes_to_nwb/spike_gadgets_raw_io.py	62.50%	3 Missing :warning:
src/trodes_to_nwb/convert_ephys.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #81 +/- ## ========================================== - Coverage 90.70% 90.56% -0.14% ========================================== Files 25 25 Lines 2398 2407 +9 ========================================== + Hits 2175 2180 +5 - Misses 223 227 +4 ```

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[samuelbray32]

Confirmed that these changes resolve conversion with non-ptp, non-unique trodes timestamps conversions