FEAT: Add CodeChameleon converter

[jl8771]

Description

Add converter based on CodeChameleon paper. Adds ability for user to specify custom
encrypt and decrypt functions in addition to existing encrypt/decrypt functions from paper.

Tests and Documentation

Test added for converter using custom encrypt and decrypt functions.

[romanlutz]

Great start @jl8771 ! Ping me when you have a version with tests and I'll make another pass.

[romanlutz]

Are you planning to add tests for the others as well or only custom?

[jl8771]

Are you planning to add tests for the others as well or only custom?

@romanlutz I had tests for the other modes as well but removed them as the standard encryption methods (reverse, binary tree, odd even, and length) are protected and should only be called internally.

If you think it would be better to add them back, I can add them.

[romanlutz]

Are you planning to add tests for the others as well or only custom?

@romanlutz I had tests for the other modes as well but removed them as the standard encryption methods (reverse, binary tree, odd even, and length) are protected and should only be called internally.

If you think it would be better to add them back, I can add them.

Can you elaborate on protected? I can call them via the constructor arg, so the underscore at the start of the method doesn't mean that users won't use the functionality. Or am I missing something?

[jl8771]

Are you planning to add tests for the others as well or only custom?

@romanlutz I had tests for the other modes as well but removed them as the standard encryption methods (reverse, binary tree, odd even, and length) are protected and should only be called internally.
If you think it would be better to add them back, I can add them.

Can you elaborate on protected? I can call them via the constructor arg, so the underscore at the start of the method doesn't mean that users won't use the functionality. Or am I missing something?

I had not considered that, only that the user would not directly call them.

I'll add the tests for those encryption functions.