Add attribution data to UpdateFulfillHtlc

[thomash-acinq]

Attribution data is added to both failed and fulfilled HTLCs
lightning/bolts#1044

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 91.42857% with 6 lines in your changes missing coverage. Please review.

Project coverage is 85.96%. Comparing base (f14b92d) to head (9e22800).
Report is 11 commits behind head on master.

Files with missing lines	Patch %	Lines
.../scala/fr/acinq/eclair/payment/PaymentPacket.scala	50.00%	4 Missing ⚠️
...src/main/scala/fr/acinq/eclair/crypto/Sphinx.scala	96.87%	1 Missing ⚠️
...r/acinq/eclair/payment/relay/OnTheFlyFunding.scala	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3100      +/-   ##
==========================================
+ Coverage   85.80%   85.96%   +0.16%     
==========================================
  Files         236      237       +1     
  Lines       21299    21557     +258     
  Branches      859      825      -34     
==========================================
+ Hits        18275    18532     +257     
- Misses       3024     3025       +1     

Files with missing lines	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)
...in/scala/fr/acinq/eclair/channel/Commitments.scala	95.63% <100.00%> (-0.51%)	⬇️
...in/scala/fr/acinq/eclair/channel/fsm/Channel.scala	83.15% <100.00%> (+0.05%)	⬆️
...cinq/eclair/payment/receive/MultiPartHandler.scala	93.90% <100.00%> (ø)
...a/fr/acinq/eclair/payment/relay/ChannelRelay.scala	96.53% <100.00%> (+0.06%)	⬆️
...cala/fr/acinq/eclair/payment/relay/NodeRelay.scala	94.33% <100.00%> (ø)
.../eclair/payment/relay/PostRestartHtlcCleaner.scala	88.77% <100.00%> (+0.05%)	⬆️
.../fr/acinq/eclair/wire/internal/CommandCodecs.scala	100.00% <100.00%> (ø)
...fr/acinq/eclair/wire/protocol/FailureMessage.scala	80.21% <100.00%> (+0.67%)	⬆️
... and 5 more

... and 9 files with indirect coverage changes

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