Implement the SCIDAlias Channel Type and provide SCID Privacy#1351

Merged

TheBlueMatt merged 9 commits intolightningdevkit:mainfrom

TheBlueMatt:2022-03-scid-privacy

Mar 28, 2022

Commits on Mar 27, 2022

Bump `check_commits` CI job rustc to 1.57
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Expose chan type in `Event::OpenChannelRequest` & `ChannelDetails`
TheBlueMatt
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Add support for the SCIDAlias feature bit in incoming channels
TheBlueMatt
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Negotiate `scid_alias` for private channels based on a new config
TheBlueMatt
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Add simple tests for our SCIDAlias implementation and negotiation
TheBlueMatt
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Make all callsites to `get_channel_update_for_unicast` fallible
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Use the correct SCID when failing HTLCs to aliased channels
TheBlueMatt
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Drop the `Writeable::encode_with_len` method in non-test buidls
TheBlueMatt
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Commits on Mar 28, 2022

Add notes about SCID alias rotation to `ChannelDetails` docs
TheBlueMatt
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