feat: Add IParsable<T> support for strongly-typed IDs

[tomilodk]

Summary

This PR adds support for primary keys that implement IParsable<T>, enabling CoreAdmin to work with strongly-typed ID patterns (DDD-style value objects).

Problem: Previously, CoreAdmin only supported Guid, int, and long primary keys. When using strongly-typed IDs like:

public record ResightsCvrSyncId(Guid Value) : IdBase<ResightsCvrSyncId>, IParsable<ResightsCvrSyncId>

Edit and Delete operations would fail with:

The key value at position 0 of the call to 'DbSet<Entity>.Find' was of type 'string', 
which does not match the property type of 'ResightsCvrSyncId'.

Solution: Added a ConvertPrimaryKey helper method that:

1. Uses fast paths for Guid, int, long, string (existing behavior)
2. Checks for IParsable<T> interface and calls the static Parse method via reflection
3. Falls back to TypeConverter if available

Changes

• Added System.ComponentModel using for TypeConverter fallback
• Introduced ConvertPrimaryKey(string id, Type clrType) static helper method
• Refactored GetEntityFromDbSet to use the new helper
• Refactored DeleteEntityPost to use the new helper

Testing

Tested locally with a .NET 10 project using strongly-typed IDs implementing IParsable<T>. Edit and Delete operations now work correctly.

Breaking Changes

None. This is fully backwards compatible - existing behavior for Guid/int/long is preserved.

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