Extended doHandle to other messages in MultiPartHandler

[pm47]

No description provided.

[t-bast]

LGTM

[codecov-io]

Codecov Report

Merging #1226 into master will increase coverage by 0.13%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1226      +/-   ##
==========================================
+ Coverage   76.28%   76.42%   +0.13%     
==========================================
  Files         140      140              
  Lines        9565     9568       +3     
  Branches      389      398       +9     
==========================================
+ Hits         7297     7312      +15     
+ Misses       2268     2256      -12

Impacted Files	Coverage Δ
...cinq/eclair/payment/receive/MultiPartHandler.scala	94.18% <100%> (+0.21%)	⬆️
...-core/src/main/scala/fr/acinq/eclair/io/Peer.scala	75.44% <0%> (+0.29%)	⬆️
...c/main/scala/fr/acinq/eclair/channel/Channel.scala	83.74% <0%> (+0.46%)	⬆️
...q/eclair/blockchain/electrum/ElectrumWatcher.scala	51.72% <0%> (+1.72%)	⬆️
...clair/blockchain/electrum/ElectrumClientPool.scala	78.49% <0%> (+4.3%)	⬆️