Add back `mintPolicy`

[samuelWilliams99]

The mintPolicy field is currently ignored, and not present in the NFTs we have minted via BPI.
This task is across several repos - to fix the minting process to include this field, and fix the metadata to not ignore it.
Blocked until debugging of frontend is complete.

[ryukzak]

Metadata:

{
"727": {
    "<policy_id>": {
        "mintPolicy": <string>,
        "collectionNftCS": <string>,
        "lockingScript": <string>,
        "authorPkh": <string>
        "authorShare": <string>,
        "marketplaceScript": <string>,
        "marketplaceShare": <string>,
        "collectionNftTN": <string>,
        "ownerPkh": <string>,
        "ownerPrice": <string>,
} }
}

where:

• policy_id = scriptHash . getMintingPolicy $ policyData collection -- hash of the mint script after arguments application

Should mintPolicy be:

1. a hash of unapplied minting script
2. human-readable string like described here: https://github.com/mlabs-haskell/seabug/pull/17/files?

Option one is here: mlabs-haskell/plutus-use-cases#363

[samuelWilliams99]

@Guilherme775

[KindaSloth]

This issue has already been resolved in these PRs/Commits:

PR
Commit
and Commit