[RealmCollectionImpl] annotate internal methods to avoid dyld crash

[ThomasAWRaku]

I was seeing a crash after migrating from Carthage to SPM. The crash doesn't occur with a simple test project, but does occur with a large app that includes many modules and libraries that use RealmSwift. When this crash occurs the following is logged on launch:

dyld[31956]: Symbol not found: _$s10RealmSwift7ResultsVyxGAA0A14CollectionImplAAMc
  Referenced from: <CA2BB602-C363-37B9-A568-54CC4C3267C6> /Users/<user>/Library/Developer/Xcode/DerivedData/OneApp-dgeqzukjzdnhcfeyiwctkbxaxuxc/Build/Products/EnterprisePreProd-iphonesimulator/NVIOSSDK.framework/NVIOSSDK
  Expected in:     <58DD162C-52B4-3DE7-91B4-17ED89341E11> /Users/<user>/Library/Developer/Xcode/DerivedData/OneApp-dgeqzukjzdnhcfeyiwctkbxaxuxc/Build/Products/EnterprisePreProd-iphonesimulator/PackageFrameworks/RealmSwift.framework/RealmSwift

The unmangled version of that symbol is protocol conformance descriptor for RealmSwift.Results<A> : RealmSwift.RealmCollectionImpl in RealmSwift.

Here are some other reports of a similar problem:
#8402
#8779
https://stackoverflow.com/questions/79512813/using-realmswift-in-a-framework-most-symbols-found-but-not-all

For our usage of RealmSwift, this crash is fixed by adding the @usableFromInline annotation to about 8 internal methods in RealmSwift.

ProductName:		macOS
ProductVersion:		15.7.4
BuildVersion:		24G517

/Applications/Xcode.app/Contents/Developer
Xcode 26.2
Build version 17C52

/Users/<user>/.rbenv/shims/pod
1.16.2

/bin/bash
GNU bash, version 3.2.57(1)-release (arm64-apple-darwin24)

/opt/homebrew/bin/carthage
0.40.0
(not in use here)

/opt/homebrew/bin/git
git version 2.51.0