Explorer: Render Source Code

[666lcz]

we can support adding an optional URL to package metadata and display the URL in the explorer.

Context: https://mysten-labs.slack.com/archives/C02DRAL32GN/p1652820425013529

[666lcz]

Chatted with @tnowacki offline:

• we don't want to embed the GitHub URL in the package metadata because URLs can be long and will increase the size of onchain data
• Instead we will store a hash of the compiled module onchain. And then the publisher of the package can visit the Explorer, and upload the source code, where the Explorer backend will re-compile the package and make sure the hashes match.

[github-actions[bot]]

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[Jordan-Mysten]

Duplicate of #1212