adding basic receiver vasp methods

[matthappens]

Receiver Vasp

This PR adds an endpoint to create an invoice, and an endpoint to create invoice + send to another uma address

Testing

run a receiver vasp on port 8080, and a sender vasp on 8081

to create an invoice
curl -u <username>:<password> -X POST "http://localhost:8080/api/uma/create_invoice?amount=100&currencyCode=USD"

to create and send an invoice to another uma
curl -u <username>:<password> -X POST "http://localhost:8080/api/uma/create_and_send_invoice/?amount=100&currencyCode=USD&senderUma=<sender uma>"

[matthappens]

• adding sender vasp demo endpoints #206
• adding basic receiver vasp methods #205 👈
• adding sending / receiving vasp methods for demo #204
• develop

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