For BOLT12 invoices, the "description" is field missing in the invoice
responses. Update the schemas accordingly:
- `doc/schemas/lightning-waitanyinvoice.json`
- `doc/schemas/lightning-waitinvoice.json`
Also commit the generated msggen, cln-grpc, cln-rpc and pyln-grpc-proto files.
Changelog-Fixed: schemas: Make description in `Wait(any)invoiceResponse` optional to handle BOLT12