add DynamicLighting attribute to Map

[Caeldeth]

Summary

• Add optional DynamicLighting boolean attribute to the Map element, defaulting to false
• Mirrors the existing IsEnabled / AllowCasting attributes ([XmlAttribute] + [DefaultValue(false)])
• One property added in src/Objects/Map.cs, one matching attribute added in src/XSD/Map.xsd

Test plan

• dotnet build succeeds
• Existing LoadDataContainsNoLoadErrors Map check still passes (catches any XSD/serialization regression)
• Downstream consumer (server-side lighting logic) can read the flag once wired up

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.50%. Comparing base (f534651) to head (f01de57).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #4   +/-   ##
=======================================
  Coverage   60.50%   60.50%           
=======================================
  Files          40       40           
  Lines        1504     1504           
  Branches      351      351           
=======================================
  Hits          910      910           
  Misses        474      474           
  Partials      120      120           

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