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What this PR does / why we need it:
A new feature to display the chaincode metadata information in Blockchain Explorer. Explorer will look into the channel and identifies the chaincodes installed on it and enables the feature to view the metadata.
Users can see the how the contract is structured and its associated metadata information.
Which issue(s) this PR fixes:
Fixes #352
Special notes for your reviewer:
Does this PR introduce a user-facing change?
Additional documentation, usage docs, etc.: