Add BIP-32 and BIP-44 support

[AArnott]

• BIP-32 HD wallet key derivations
• BIP-44 formalized pattern for key path derivations

[codecov-commenter]

Codecov Report

Merging #5 (4f11696) into main (cfc3eab) will decrease coverage by 0.13%.
The diff coverage is 93.91%.

@@            Coverage Diff             @@
##             main       #5      +/-   ##
==========================================
- Coverage   96.39%   96.27%   -0.13%     
==========================================
  Files          41       58      +17     
  Lines        2412     3218     +806     
==========================================
+ Hits         2325     3098     +773     
- Misses         87      120      +33     

Flag	Coverage Δ
LinuxHost	96.27% <93.91%> (-0.13%)	⬇️
Release	96.27% <93.91%> (-0.13%)	⬇️
WindowsHost	96.27% <93.91%> (-0.13%)	⬇️
macOSHost	96.27% <93.91%> (-0.13%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/Nerdbank.Cryptocurrencies/Base58Check.cs	100.00% <ø> (ø)
src/Nerdbank.Cryptocurrencies/BitUtilities.cs	35.71% <32.07%> (-64.29%)	⬇️
....Cryptocurrencies/Bip32HDWallet.ExtendedKeyBase.cs	92.39% <92.39%> (ø)
...c/Nerdbank.Cryptocurrencies/Bip44MultiAccountHD.cs	93.33% <93.33%> (ø)
...ryptocurrencies/Bip32HDWallet.ExtendedPublicKey.cs	93.61% <93.61%> (ø)
...yptocurrencies/Bip32HDWallet.ExtendedPrivateKey.cs	93.75% <93.75%> (ø)
src/Nerdbank.Cryptocurrencies/Bech32.cs	95.10% <100.00%> (ø)
...Nerdbank.Cryptocurrencies/Bip32HDWallet.KeyPath.cs	100.00% <100.00%> (ø)
...dbank.Cryptocurrencies/Bip32HDWallet.PrivateKey.cs	100.00% <100.00%> (ø)
...rdbank.Cryptocurrencies/Bip32HDWallet.PublicKey.cs	100.00% <100.00%> (ø)
... and 13 more