Plumb `CommitmentConfig` down into `thin-client`. #11090

Job	Run time
android (ubuntu-20.04, x86_64-linux-android)	2m 57s
android (ubuntu-20.04, aarch64-linux-android)	3m 6s
ios (macos-11, aarch64-apple-ios)	7m 10s
android (ubuntu-20.04, i686-linux-android)	2m 56s
ios (macos-11, x86_64-apple-ios)	7m 39s
ios (macos-11, aarch64-apple-darwin)	7m 26s
android (ubuntu-20.04, armv7-linux-androideabi)	3m 22s
ios (macos-11, x86_64-apple-darwin)	8m 9s
error_reporting	0s
	42m 45s

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