BMSNAV parse/build for Samus Returns

[steven11sjf]

• mostly just a simpler format of Dread's navmesh
• geo_connections have 3 bytes added to the start of each entry
• there's an unknown struct that seems to be there for metroids, probably similar to how emmy actions are in dread

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03% :tada:

Comparison is base (edd33d0) 69.10% compared to head (f61d0f2) 69.14%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #64 +/- ## ========================================== + Coverage 69.10% 69.14% +0.03% ========================================== Files 54 54 Lines 2544 2547 +3 ========================================== + Hits 1758 1761 +3 Misses 786 786 ``` | [Files Changed](https://app.codecov.io/gh/randovania/mercury-engine-data-structures/pull/64?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=randovania) | Coverage Δ | | |---|---|---| | [...c/mercury\_engine\_data\_structures/formats/bmsnav.py](https://app.codecov.io/gh/randovania/mercury-engine-data-structures/pull/64?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=randovania#diff-c3JjL21lcmN1cnlfZW5naW5lX2RhdGFfc3RydWN0dXJlcy9mb3JtYXRzL2Jtc25hdi5weQ==) | `100.00% <100.00%> (ø)` | |

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