refactor(key-wallet-ffi): remove and replaced FFIExtendedPrivateKey with FFIExtendedPrivKey

[ZocoLini]

so, for some reason, we have twice the same structure but with slightly different name and this was causing issues when trying to recover some old tests that are out of scope right now

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📥 Commits

Reviewing files that changed from the base of the PR and between 383b306 and 3198461.

📒 Files selected for processing (4)

• key-wallet-ffi/FFI_API.md
• key-wallet-ffi/src/account_derivation.rs
• key-wallet-ffi/src/derivation.rs
• key-wallet-ffi/src/keys.rs

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• Create PR with unit tests
• Commit unit tests in branch refactor/remove-FFIExtendedPrivateKey

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[codecov]

Codecov Report

❌ Patch coverage is 10.52632% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.86%. Comparing base (383b306) to head (3198461).
⚠️ Report is 2 commits behind head on v0.42-dev.

Files with missing lines	Patch %	Lines
key-wallet-ffi/src/account_derivation.rs	0.00%	9 Missing ⚠️
key-wallet-ffi/src/keys.rs	16.66%	5 Missing ⚠️
key-wallet-ffi/src/derivation.rs	25.00%	3 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           v0.42-dev     #645      +/-   ##
=============================================
+ Coverage      67.48%   67.86%   +0.38%     
=============================================
  Files            246      318      +72     
  Lines          49280    67780   +18500     
=============================================
+ Hits           33256    46001   +12745     
- Misses         16024    21779    +5755     

Flag	Coverage Δ
core	75.21% <ø> (ø)
ffi	38.81% <10.52%> (+2.42%)	⬆️
rpc	20.00% <ø> (ø)
spv	85.31% <ø> (-0.08%)	⬇️
wallet	67.56% <ø> (?)

Files with missing lines	Coverage Δ
key-wallet-ffi/src/derivation.rs	25.98% <25.00%> (+12.58%)	⬆️
key-wallet-ffi/src/keys.rs	13.28% <16.66%> (+8.34%)	⬆️
key-wallet-ffi/src/account_derivation.rs	0.00% <0.00%> (ø)

... and 91 files with indirect coverage changes