Add @bjacob and myself to Encoding dialect owners. (#18712)

Author: hanhanW

.github/CODEOWNERS

@@ -64,6 +64,7 @@
 /compiler/src/iree/compiler/Codegen/SPIRV/ @antiagainst @MaheshRavishankar @kuhar
 /compiler/src/iree/compiler/Codegen/TransformStrategies/ @qedawkins @MaheshRavishankar
 /compiler/src/iree/compiler/ConstEval/ @hanhanW @stellaraccident
+/compiler/src/iree/compiler/Dialect/Encoding/ @bjacob @hanhanW
 /compiler/src/iree/compiler/Dialect/Flow/ @hanhanW @MaheshRavishankar @IanWood1
 /compiler/src/iree/compiler/Dialect/LinalgExt/ @hanhanW @MaheshRavishankar
 /compiler/src/iree/compiler/Dialect/Vulkan/ @antiagainst @kuhar