RNET-1134: Add obfuscation attribute on generated RealmSchema

[nirinchev]

Description

I went through our reflection usages and it appears the unity initializer and RealmSchema are the low-hanging items here. There are a few more places where I'm not sure if we want to apply the obfuscation attribute:

• MetaRealmObject:

  realm-dotnet/Realm/Realm/Dynamic/MetaRealmObject.cs

  Lines 40 to 54 in 93bbd4b

  	private static readonly PropertyInfo RealmObjectRealmProperty = typeof(IRealmObjectBase).GetProperty(nameof(IRealmObjectBase.Realm), PrivateBindingFlags)!;
  	private static readonly FieldInfo ObjectMetadataSchemaField = typeof(Metadata).GetField(nameof(Metadata.Schema), PrivateBindingFlags)!;
  	private static readonly MethodInfo SchemaGetNameProperty = typeof(ObjectSchema).GetProperty(nameof(ObjectSchema.Name), PrivateBindingFlags)!.GetMethod!;
  	private static readonly MethodInfo RealmObjectGetBacklinksForHandle_RealmObject = GetExtensionsMI(nameof(RealmObjectExtensions.GetBacklinksForHandle))
  	.MakeGenericMethod(typeof(DynamicRealmObject));
  	private static readonly MethodInfo RealmObjectGetBacklinksForHandle_EmbeddedObject = GetExtensionsMI(nameof(RealmObjectExtensions.GetBacklinksForHandle))
  	.MakeGenericMethod(typeof(DynamicEmbeddedObject));
  	private static readonly MethodInfo RealmObjectGetObjectHandleMethod = GetExtensionsMI(nameof(RealmObjectExtensions.GetObjectHandle));
  	private static readonly MethodInfo RealmObjectGetMetadataMethod = GetExtensionsMI(nameof(RealmObjectExtensions.GetObjectMetadata));
  	private static readonly MethodInfo RealmValueGetMethod = typeof(RealmValue).GetMethod(nameof(RealmValue.As), BindingFlags.Public | BindingFlags.Instance)!;
  	private static readonly MethodInfo CreateRealmValueMethod = typeof(RealmValue).GetMethod(nameof(RealmValue.Create), BindingFlags.NonPublic | BindingFlags.Static)!;

  
  The problem here is that we'd need to annotate a bunch of properties/fields in the Realm assembly and with no actual tests, I can see this easily diverging over time.
• RealmSchema:

  realm-dotnet/Realm/Realm/Schema/RealmSchema.cs

  Lines 52 to 54 in 93bbd4b

  	var moduleInitializers = AppDomain.CurrentDomain.GetAssemblies()
  	.Select(assembly => assembly.GetType("RealmModuleInitializer")?.GetMethod("Initialize"))
  	.Where(method => method != null);

  
  This is generated by the weaver, so it's a bit more annoying to add the attribute. Without it, we wouldn't get auto schema discovery on Unity though, so I'm tempted to just bite the bullet and add it.

Fixes #3574

TODO

• Changelog entry
• Tests

[coveralls-official]

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Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 81.27%

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Totals
Change from base Build 9182105591:	0.0%
Covered Lines:	6831
Relevant Lines:	8261

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