chore(smithy): Service clients prep #1349

Job	Run time
test / Test (3.0.1)	5m 14s
test / Test (3.0.1)	5m 14s
test / Test (stable)	4m 46s
test / Test (stable)	4m 46s
test / Test (beta)	5m 5s
test / Test (beta)	5m 5s
native_test / Native Test (macos-latest)	8m 2s
native_test / Native Test (macos-latest)	8m 2s
native_test / Native Test (windows-latest)	9m 15s
native_test / Native Test (windows-latest)	9m 15s
dart2js_test / Test (3.0.1, chrome)	17m 41s
dart2js_test / Test (3.0.1, chrome)	20m 42s
dart2js_test / Test (3.0.1, firefox)	17m 49s
dart2js_test / Test (3.0.1, firefox)	17m 49s
dart2js_test / Test (stable, chrome)	23m 3s
dart2js_test / Test (stable, chrome)	23m 3s
dart2js_test / Test (stable, firefox)	18m 15s
dart2js_test / Test (stable, firefox)	18m 15s
dart2js_test / Test (beta, chrome)	22m 38s
dart2js_test / Test (beta, chrome)	22m 38s
dart2js_test / Test (beta, firefox)	20m 50s
dart2js_test / Test (beta, firefox)	20m 50s
ddc_test / Test (3.0.1, chrome)	15m 7s
ddc_test / Test (3.0.1, chrome)	15m 7s
ddc_test / Test (3.0.1, firefox)	11m 28s
ddc_test / Test (3.0.1, firefox)	11m 28s
ddc_test / Test (stable, chrome)	20m 10s
ddc_test / Test (stable, chrome)	20m 10s
ddc_test / Test (stable, firefox)	11m 45s
ddc_test / Test (stable, firefox)	11m 45s
ddc_test / Test (beta, chrome)	20m 35s
ddc_test / Test (beta, chrome)	20m 35s
ddc_test / Test (beta, firefox)	13m 6s
ddc_test / Test (beta, firefox)	13m 6s
	8h 12m 39s

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