Add UI for batch minting bounties

[FlacoJones]

I added a new method in the contracts for batch minting bounties. It's interface looks like this:

    function batchMintBounty(
        string[] calldata _bountyIds,
        string[] calldata _organizations,
        OpenQDefinitions.InitOperation[] memory _initOperations
    )

As you can see, identical to mint bounty, but in array form, where matching index means matching input

I'm not sure what would be simplest here:

A) Adding a (+) icon on the mintbountymodal to add additional bounties
B) Create a new page

It's likely that we'll want to set A) KYC required, B) Invoice, and C) Supporting tax form required once for all bounties by default

Will also be quite helpful, since people may do a lot at once, to persist the form between page reloads using local storage. And once minted, remove the local storage