Attributable errors

[thomash-acinq]

This is an implementation of the fat error proposal lightning/bolts#1044

[joostjager]

If you want to do interop testing, you can use lightningnetwork/lnd#7139. It supports fat errors as sender/intermediate/final node and populates the hold time field as well.

[codecov-commenter]

Codecov Report

Merging #2519 (5858fed) into master (772e2b2) will increase coverage by 0.02%.
Report is 1 commits behind head on master.
The diff coverage is 84.29%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2519      +/-   ##
==========================================
+ Coverage   85.84%   85.86%   +0.02%     
==========================================
  Files         216      217       +1     
  Lines       18158    18242      +84     
  Branches      760      798      +38     
==========================================
+ Hits        15588    15664      +76     
- Misses       2570     2578       +8     

Files	Coverage Δ
...core/src/main/scala/fr/acinq/eclair/Features.scala	100.00% <100.00%> (ø)
...in/scala/fr/acinq/eclair/channel/ChannelData.scala	100.00% <ø> (ø)
...q/eclair/payment/receive/MultiPartPaymentFSM.scala	95.12% <ø> (ø)
...a/fr/acinq/eclair/payment/relay/ChannelRelay.scala	95.90% <100.00%> (+0.03%)	⬆️
.../eclair/payment/relay/PostRestartHtlcCleaner.scala	90.55% <100.00%> (ø)
.../fr/acinq/eclair/wire/internal/CommandCodecs.scala	100.00% <ø> (ø)
...a/fr/acinq/eclair/wire/protocol/CommonCodecs.scala	97.33% <100.00%> (+0.03%)	⬆️
...fr/acinq/eclair/wire/protocol/FailureMessage.scala	80.23% <100.00%> (ø)
...cala/fr/acinq/eclair/payment/relay/NodeRelay.scala	96.57% <87.50%> (ø)
.../scala/fr/acinq/eclair/payment/relay/Relayer.scala	89.13% <66.66%> (ø)
... and 6 more

... and 4 files with indirect coverage changes