Add receiving user argument to "mint programmable tokens" endpoint

[j-mueller]

issueProgrammableTokenTx currently sends the new tokens to an output with no stake credential. We should send them directly to the end user.

• Add a PaymentCredential argument to BuildTx.issueProgrammableToken
• Use the payment credential as the stake credential of the programmable logic output that's constructed in l. 111 (Adjusting the receivingAddress value)
• Propagate the PaymentCredential argument to Wst.Offchain.Endpoints.Deployment.issueProgrammableTokenTx and Wst.Server.Types.IssueProgrammableTokenArgs
• Change Wst.Test.UnitTest.issueAlwaysSucceedsValidator to check that the programmable logic output has the correct stake credential