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BOLT12 introduces "offers", which are reusable payment requests (a.k.a. static invoices). Add the following phoenix-cli/api methods: - `getoffer` - `payoffer` - `decodeinvoice` (supersedes #56) - `decodeoffer` --------- Co-authored-by: Dominique Padiou <5765435+dpad85@users.noreply.github.com>