Allow btcpayserver to assign a address permanently to a Data/user

[lucidddreams]

Is your feature request related to a problem? Please describe.
The current btcpayserver implementation is limited to invoicing which cannot be applied for bitcoin exchange services or any alike

Describe the solution you'd like
A clear and concise description of what you want to happen.
Allow API to assign permanent bitcoin address to specific user or value. https://api.bitgo.com/docs/#operation/v2.wallet.addresses

Sketch/Image/Wireframe/Mockup
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n/a

Describe alternatives you've considered
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Additional context
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It would be great is btcpayserver will also have a bitgo.com alike feature where a master wallet can have multiple wallets under it which can be assigned to specific user or data