Use CLTV expiry when computing reputation

[thomash-acinq]

When computing reputation, instead of using a fixed multiplier for pending HTLCs, we now use the CLTV expiry of the HTLC (assuming a new block is mined every 10 minutes).
The reason for the fixed multiplier was that a HTLC with the maximum CLTV delta could stay pending for several orders of magnitude longer than a regular HTLC and would have an oversized impact on the reputation. We mitigate this by increasing the expected settlement time (from a few seconds to a few minutes), using more historical data (increasing the half-life), and counting on the fact that most HTLCs will have a CLTV expiry a lot lower than the maximum.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.06%. Comparing base (09fc936) to head (c29aa18).
⚠️ Report is 8 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3134      +/-   ##
==========================================
+ Coverage   86.04%   86.06%   +0.01%     
==========================================
  Files         239      239              
  Lines       21831    21866      +35     
  Branches      822      858      +36     
==========================================
+ Hits        18785    18819      +34     
- Misses       3046     3047       +1     

Files with missing lines	Coverage Δ
...re/src/main/scala/fr/acinq/eclair/NodeParams.scala	92.26% <ø> (-0.02%)	⬇️
...in/scala/fr/acinq/eclair/channel/fsm/Channel.scala	83.62% <100.00%> (+0.11%)	⬆️
...a/fr/acinq/eclair/payment/relay/ChannelRelay.scala	96.62% <100.00%> (ø)
...r/acinq/eclair/payment/send/PaymentLifecycle.scala	84.40% <100.00%> (+0.07%)	⬆️
.../scala/fr/acinq/eclair/reputation/Reputation.scala	98.27% <100.00%> (+0.54%)	⬆️
...r/acinq/eclair/reputation/ReputationRecorder.scala	93.33% <100.00%> (+0.83%)	⬆️

... and 3 files with indirect coverage changes

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