add in method for building a `TpuClient` for `LocalCluster` tests #358

Job	Run time
ios (macos-11, aarch64-apple-ios)	6m 59s
android (ubuntu-20.04, x86_64-linux-android)	3m 5s
ios (macos-11, x86_64-apple-ios)	6m 59s
android (ubuntu-20.04, aarch64-linux-android)	3m 4s
ios (macos-11, aarch64-apple-darwin)	6m 4s
ios (macos-11, x86_64-apple-darwin)	6m 12s
android (ubuntu-20.04, i686-linux-android)	2m 57s
android (ubuntu-20.04, armv7-linux-androideabi)	3m 17s
error_reporting	0s
	38m 37s

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