Implement LSPS1

[JssDWt]

• [ ] create an LSPS1 client in an LSPS1 module
• [ ] create a order_channel_info function in BreezServices that is similar to lsps1.info
• [ ] create a order_channel function in BreezServices that is similar to LSPS1.create_order, with sane defaults. It returns an object with an invoice+onchain address to pay, the fees and channel information. Persist the order for future reference.
• [ ] create a get_channel_order_info function in BreezServices that returns info about the channel order. Either from disk or from the lsp.
• [ ] Potentially monitor the onchain payment address in case of a dispute.

Above methods should all work with a state machine for LSPS1 channels that provides guidance on whether an action is legal or not.

Optionally LDK can be used as a dependency: https://github.com/lightningdevkit/ldk-lsp-client/pull/8

A potentially problematic moment is the moment the user paid for the channel open, but the user is not online when the LSP tries to open the channel.