add provider url in the details page for datasets

[Tomcli]

Is your feature request related to a problem? Please describe. For the datasets, we want to expose the provider.url in the details page and let users to redirect to the developer.ibm.com

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Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.

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[ckadner]

@Tomcli -- Given the DAX integration work with READMEs for each dataset, addressing this issue may no longer be necessary. Should we close it?