improve Bech32 encode / decode

[tweakch]

just a backing issue for future improvement

cardanosharp-wallet/CardanoSharp.Wallet/Encoding/Bech32.cs

Lines 159 to 164 in 4d0ffa7

	private byte[] ConvertBits(byte[] data, int fromBits, int toBits, bool pad = true)
	{
	// TODO: Optimize Looping
	// We can use a method similar to BIP39 here to avoid the nested loop, usage of List, increase the speed,
	// and shorten this function to 3 lines.
	// Or convert to ulong[], loop through it (3 times) take 5 bits at a time or 8 bits at a time...

Maybe the implementations of System.Convert.ToBase64String() and/or Base32 can give a hint on how to improve this method

That said, keeping it clsoe to the reference implementations of BIP32 is a good idea

[nothingalike]

@tweakch
status of this issue?