Add option to use mirror storage site for installation #45
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Background: Flutter installation is slow in some regions and official document suggests using mirror site in such cases. Ref: https://flutter.dev/community/china
This PR adds an option to select known mirrors, as well as migrating some stale dependencies to latest. Please let me know your concerns, thanks!
vsts-task-lib is deprecated. Use azure-pipelines-task-lib instead.
vsts-task-tool-lib is deprecated. Use azure-pipelines-tool-lib.