Use bitcoin-kmp through bitcoin-lib

[sstone]

We use a version of bitcoin-lib that uses bitcoin-kmp under the hood (see ACINQ/bitcoin-lib#63)
Its API is the same as before, but its package is now fr.acinq.bitcoinscala.

This is an alternative to #1949 that is much less invasive and will allow us to mix eclair and lightning-kmp.

There is a significant breaking change in bitcoin-lib: we only support OSes that are compatible with secp256k1-kmp (i.e we don't fallback to bouncycastle anymore if it cannot be loaded). In practice it means that eclair won't run on some 32 bits OSes and possibly some linux distros.

The version of bitcoin-lib that is used here is 0.20-KMP-SNAPSHOT, which is published to https://oss.sonatype.org/content/repositories/snapshots/. This is why this is a draft PR. If it is accepted I'll publish a new bitcoin-lib release to maven central and update this PR.

EDIT: this PR is now based on bitcoin-lib 0.22 which is available on maven central, supports Linux Arm64 (through bitcoin-kmp 0.8.3) and can be merged as-is.

[codecov-commenter]

Codecov Report

Merging #2038 (3b701d5) into master (5af042a) will decrease coverage by 0.06%.
The diff coverage is 67.50%.

@@            Coverage Diff             @@
##           master    #2038      +/-   ##
==========================================
- Coverage   83.92%   83.86%   -0.07%     
==========================================
  Files         186      186              
  Lines       13943    13953      +10     
  Branches      576      565      -11     
==========================================
  Hits        11701    11701              
- Misses       2242     2252      +10     

Impacted Files	Coverage Δ
...r-core/src/main/scala/fr/acinq/eclair/Eclair.scala	50.84% <ø> (ø)
...air-core/src/main/scala/fr/acinq/eclair/Logs.scala	83.05% <ø> (ø)
.../src/main/scala/fr/acinq/eclair/MilliSatoshi.scala	100.00% <ø> (ø)
...re/src/main/scala/fr/acinq/eclair/NodeParams.scala	92.77% <ø> (ø)
.../src/main/scala/fr/acinq/eclair/PluginParams.scala	0.00% <ø> (ø)
...ir-core/src/main/scala/fr/acinq/eclair/Setup.scala	79.00% <ø> (ø)
...n/scala/fr/acinq/eclair/balance/BalanceActor.scala	10.16% <ø> (ø)
...ala/fr/acinq/eclair/balance/ChannelsListener.scala	93.10% <ø> (ø)
...n/scala/fr/acinq/eclair/balance/CheckBalance.scala	66.30% <ø> (ø)
.../acinq/eclair/blockchain/bitcoind/ZmqWatcher.scala	88.13% <ø> (ø)
... and 112 more

[t-bast]

Just a quick first pass, I need to play around more with the code

[t-bast]

I'm not seeing anything weird after playing with this version on regtest, and the minimal code changes look good to me.

[t-bast]

ACK 5de05d5

[pm47]

I just put this blocker upstream: ACINQ/bitcoin-lib#63 (review)

[sstone]

We now use bitcoin-kmp 0.21-KMP, bitcoin-kmp 0.8.3 and secp256k1-kmp 0.6.3 (which includes JNI bindings for Linux Arm64).

[t-bast]

LGTM, just one nit