allow a server to charge for api calls

[petermchale]

Description

Given that micropayments (e.g., less than a cent) are now possible, we may now endow servers with the ability to micro-charge their users for each API call, thereby financing the services the server offers (e.g., storage, compute) in proportion to usage, which is how AWS charges the users of its servers.

Affected Dependencies

None.

How has this been tested?

• All the driver code (bash, python and jupyter) in the payments directory run successfully on Mac Silicon.

Checklist

• [X] I have followed the Contribution Guidelines and Code of Conduct
• [X] I have commented my code following the OpenMined Styleguide
• [ ] I have labeled this PR with the relevant Type labels
• [ ] My changes are covered by tests

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[petermchale]

@madhavajay: is this feature likely to get incorporated into pysyft at some point?