Oliveira functions

[reneroliveira]

New PKE examples:

• Iterative ckks example
• Function evaluation
• Polynomial evaluation

BinFHE support:

• BinFHEContext with EvalBinGate, KeyGen, etc
• Encrypt/Decrypt wrappers
• Enums

Code Optimization:

• Removing the wrapper layer for MakeCKKSPackedPlaintext and binding it directly
• Adding Decrypt function to CryptoContext class

[reneroliveira]

Overall it is looking good! I had a few things to follow up on so just LMK once you've gotten around to them

Thanks @IanQS! I've made new commits with your suggestions.