[llvm] [NFC][LLVM] Add RealtimeSanitizer LLVM code owners (PR #101231)

[Fangrui Song via llvm-commits]

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@@ -263,3 +263,7 @@ D: C-SKY backend (lib/Target/CSKY/*)
 N: Ilia Diachkov
 E: ilia.diachkov at gmail.com
 D: SPIR-V backend (lib/Target/SPIRV/*)
+
+N: Christopher Apple, David Trevelyan
+E: cja-private at pm.me, realtime.sanitizer at gmail.com
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MaskRay wrote:

It's better to use an email address for contribution instead of `realtime.sanitizer`, which might forward to you, but are not associated with any commits.

https://github.com/llvm/llvm-project/pull/101231