grpc: adding support for `Offer`#6

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hydra-yse wants to merge 4 commits intocdecker:masterfrom

hydra-yse:20231122-offer-grpc

Commits on Nov 23, 2023

fix: fixing start_any_period type for offer recurrence
vacwmX
committed

Commits on Nov 24, 2023

feat: adding offer request method to grpc
vacwmX
committed
feat: adding offer command to pyln-testing and msggen
vacwmX
committed
doc: adding documentation for cln offer command
vacwmX
committed