Adding occupation operators and updating .parse to include bosons

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Codecov Report

Attention: Patch coverage is 93.58974% with 5 lines in your changes missing coverage. Please review.

Project coverage is 83.47%. Comparing base (b74d48d) to head (c8baaf7).

Files	Patch %	Lines
openparticle/src.py	91.22%	5 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #35 +/- ## ========================================== + Coverage 80.44% 83.47% +3.03% ========================================== Files 8 8 Lines 1212 1271 +59 ========================================== + Hits 975 1061 +86 + Misses 237 210 -27 ```

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