Add support for taproot outputs to our "input info" class

[sstone]

This is a preparation PR for simple taproot channels, which extends InputInfo to support spending taproot outputs (to spend v0 outputs we need a redeem script, but to spend v1 taproot output we need a script tree and an internal public key).
Changes are generic (i.e. not tied to specific details of the simple taproot channels extension proposal).

[remyers]

Seems like pretty safe refactors. I just had one scala related question for my own information.

[sstone]

This PR is now based on #2747

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 86.30137% with 50 lines in your changes missing coverage. Please review.

Project coverage is 86.02%. Comparing base (5410146) to head (a842915).
Report is 19 commits behind head on master.

Files with missing lines	Patch %	Lines
...in/scala/fr/acinq/eclair/channel/fsm/Channel.scala	79.03%	26 Missing ⚠️
...la/fr/acinq/eclair/transactions/Transactions.scala	92.22%	7 Missing ⚠️
...c/main/scala/fr/acinq/eclair/channel/Helpers.scala	88.67%	6 Missing ⚠️
...la/fr/acinq/eclair/channel/fsm/ErrorHandlers.scala	40.00%	6 Missing ⚠️
...ire/internal/channel/version4/ChannelCodecs4.scala	90.47%	2 Missing ⚠️
...n/scala/fr/acinq/eclair/balance/CheckBalance.scala	0.00%	1 Missing ⚠️
...q/eclair/channel/publish/ReplaceableTxFunder.scala	66.66%	1 Missing ⚠️
...la/fr/acinq/eclair/io/OpenChannelInterceptor.scala	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2895      +/-   ##
==========================================
- Coverage   86.19%   86.02%   -0.17%     
==========================================
  Files         224      227       +3     
  Lines       20074    20610     +536     
  Branches      813      816       +3     
==========================================
+ Hits        17302    17729     +427     
- Misses       2772     2881     +109     

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% <100.00%> (ø)
...in/scala/fr/acinq/eclair/channel/Commitments.scala	96.66% <100.00%> (-0.17%)	⬇️
...a/fr/acinq/eclair/channel/fsm/CommonHandlers.scala	89.36% <100.00%> (+4.06%)	⬆️
...inq/eclair/channel/fund/InteractiveTxBuilder.scala	93.03% <100.00%> (ø)
...air/crypto/keymanager/LocalChannelKeyManager.scala	100.00% <100.00%> (ø)
...n/scala/fr/acinq/eclair/io/PeerReadyNotifier.scala	71.75% <100.00%> (+0.21%)	⬆️
...n/scala/fr/acinq/eclair/json/JsonSerializers.scala	96.42% <ø> (ø)
...ire/internal/channel/version0/ChannelCodecs0.scala	95.85% <100.00%> (+0.02%)	⬆️
...wire/internal/channel/version0/ChannelTypes0.scala	100.00% <100.00%> (ø)
... and 15 more

... and 27 files with indirect coverage changes

[t-bast]

I think this is now a safe refactoring that we should put on master to simplify dependent PRs. Since #2747 is still blocked waiting for lnd to finish their implementation, can you rebase this PR directly on master? This way we can integrate it this week.

[sstone]

rebased on master (27ba60f)

[t-bast]

LGTM 👍