fix(react-storage): url encode copy source

[AllanZhengYP]

Description of changes

Add URI encoding to the copy source to handle copying the object key containing special characters. Techinically it should be added to the Amplify JS library. However, since customers may have already encode the copy source to workaround this problem, it's not safe to introduce the change in Amplify JS library.

Add this change to StorageBrowser will prevent breaking change but also handle the scpecial characters in the source.

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Latest commit: fede61f4b466311478cb38b4fb4ec5f8048f93a2

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