Use psbt to fund and sign transactions

[sstone]

Based on https://github.com/ACINQ/eclair/pull/2038. We use bitcoin-kmp's Psbt classes and methods directly (there is no need for a wrapper here imho).

[codecov-commenter]

Codecov Report

Merging #2120 (d864edb) into master (0de91f4) will decrease coverage by 0.02%. The diff coverage is 88.09%.

@@            Coverage Diff             @@
##           master    #2120      +/-   ##
==========================================
- Coverage   84.88%   84.85%   -0.03%     
==========================================
  Files         198      198              
  Lines       15796    15841      +45     
  Branches      658      675      +17     
==========================================
+ Hits        13408    13442      +34     
- Misses       2388     2399      +11     

Impacted Files	Coverage Δ
...ala/fr/acinq/eclair/blockchain/OnChainWallet.scala	100.00% <ø> (ø)
...in/scala/fr/acinq/eclair/channel/fsm/Channel.scala	86.16% <ø> (ø)
...q/eclair/channel/publish/ReplaceableTxFunder.scala	85.64% <82.14%> (-1.27%)	:arrow_down:
...ir/blockchain/bitcoind/rpc/BitcoinCoreClient.scala	94.73% <100.00%> (-1.63%)	:arrow_down:
...q/eclair/channel/fsm/ChannelOpenSingleFunded.scala	94.16% <100.00%> (-0.03%)	:arrow_down:
...fr/acinq/eclair/channel/InteractiveTxBuilder.scala	84.55% <0.00%> (-1.05%)	:arrow_down:
...clair/channel/publish/ReplaceableTxPublisher.scala	74.19% <0.00%> (+0.64%)	:arrow_up:

[sstone]

Not needed anymore, see https://github.com/ACINQ/eclair/pull/2613