Move the `DTDConnectionInfo` typedef to a different library (#7660) #800

Job	Run time
flutter-prep / ubuntu-latest Flutter Prep	23s
flutter-prep / macos-latest Flutter Prep	52s
Dart Code Metrics	2m 35s
main	5m 58s
devtools_extensions integration-test integration_dart2js	10m 17s
build_ddc	3m 10s
devtools_app integration-test integration_dart2js - flutter - shard 1/3	11m 19s
devtools_app integration-test integration_dart2js - flutter - shard 2/3	20m 7s
build_dart2js	3m 10s
macos goldens test_dart2js	6m 13s
devtools_app_shared test	2m 30s
test_ddc	7m 59s
devtools_app integration-test integration_dart2js - flutter - shard 3/3	20m 26s
devtools_extensions test	2m 56s
test_dart2js	9m 54s
devtools_shared test	2m 37s
devtools_app integration-test integration_dart2js - flutter-web - shard 1/2	11m 29s
devtools_app integration-test integration_dart2js - flutter-web - shard 2/2	16m 54s
benchmark-performance	5m 45s
devtools_app integration-test integration_dart2js - dart-cli - shard 1/1	15m 30s
benchmark-size	3m 15s
	2h 43m 19s

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