fix(loadout): handle CBA Extended Loadout for IntoArma

[LinkIsGrim]

• Close Loadout::to_arma() skips CBA Extended Loadout info #56

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.9%. Comparing base (9b736a7) to head (0b38edf).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
arma-rs/src/value/loadout/extended.rs	84.6% <100.0%> (+23.6%)	⬆️
arma-rs/src/value/loadout/mod.rs	85.1% <100.0%> (+1.3%)	⬆️

... and 3 files with indirect coverage changes

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