- Add tests for BMSLD parse and build

[ThanatosGit]

• Add tests for BMSLD methods

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.95% :tada:

Comparison is base (3e60836) 72.17% compared to head (bed95cd) 73.13%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #77 +/- ## ========================================== + Coverage 72.17% 73.13% +0.95% ========================================== Files 56 56 Lines 3030 3030 ========================================== + Hits 2187 2216 +29 + Misses 843 814 -29 ``` | [Files Changed](https://app.codecov.io/gh/randovania/mercury-engine-data-structures/pull/77?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=randovania) | Coverage Δ | | |---|---|---| | [...rc/mercury\_engine\_data\_structures/formats/bmsld.py](https://app.codecov.io/gh/randovania/mercury-engine-data-structures/pull/77?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=randovania#diff-c3JjL21lcmN1cnlfZW5naW5lX2RhdGFfc3RydWN0dXJlcy9mb3JtYXRzL2Jtc2xkLnB5) | `96.22% <100.00%> (+49.05%)` | :arrow_up: | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/randovania/mercury-engine-data-structures/pull/77/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=randovania)

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