Chore(logging): move queued-item-store into aws_logging_cloudwatch #1865

Job	Run time
test / test-dart-vm (3.0.1)	3m 45s
test / test-dart-vm (stable)	2m 20s
native_test / test-dart-native (macos-latest)	4m 53s
ddc_test / test-dart-ddc (3.0.1, chrome)	4m 9s
dart2js_test / test-dart-2js (3.0.1, chrome)	4m 4s
native_test / test-dart-native (windows-latest)	3m 57s
dart2js_test / test-dart-2js (3.0.1, firefox)	3m 49s
ddc_test / test-dart-ddc (3.0.1, firefox)	3m 20s
dart2js_test / test-dart-2js (stable, chrome)	3m 50s
ddc_test / test-dart-ddc (stable, chrome)	3m 17s
dart2js_test / test-dart-2js (stable, firefox)	3m 36s
ddc_test / test-dart-ddc (stable, firefox)	3m 14s
	44m 14s

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