Removes Cocoapod-generated files

src/objective-c/examples/Sample/Podfile.lock

...examples/Sample/Pods/Headers/Public/GRPCClient/GRPCCall.h

...es/Sample/Pods/Headers/Public/GRPCClient/GRPCMethodName.h

...Sample/Pods/Headers/Public/RxLibrary/GRXImmediateWriter.h

...s/Sample/Pods/Headers/Public/RxLibrary/GRXMappingWriter.h

...mples/Sample/Pods/Headers/Public/RxLibrary/GRXWriteable.h

...ample/Pods/Headers/Public/RxLibrary/GRXWriter+Immediate.h

...Pods/Headers/Public/RxLibrary/GRXWriter+Transformations.h

...examples/Sample/Pods/Headers/Public/RxLibrary/GRXWriter.h

...mple/Pods/Headers/Public/RxLibrary/NSEnumerator+GRXUtil.h

...-c/examples/Sample/Pods/Local Podspecs/GRPCClient.podspec

...e-c/examples/Sample/Pods/Local Podspecs/RxLibrary.podspec

src/objective-c/examples/Sample/Pods/Manifest.lock

...ive-c/examples/Sample/Pods/Pods.xcodeproj/project.pbxproj

...rt Files/Pods-GRPCClient/Pods-GRPCClient-Private.xcconfig

...get Support Files/Pods-GRPCClient/Pods-GRPCClient-dummy.m

... Support Files/Pods-GRPCClient/Pods-GRPCClient-prefix.pch

...et Support Files/Pods-GRPCClient/Pods-GRPCClient.xcconfig

...port Files/Pods-RxLibrary/Pods-RxLibrary-Private.xcconfig

...arget Support Files/Pods-RxLibrary/Pods-RxLibrary-dummy.m