Web assembly preliminary bindings

Build test with emmake make emscripten_binfhe and run it with node js/example/boolean.js.

Most of the required changes were simply adding non-overloaded C++ methods such that EMSCRIPTEN can easily infer the types.

Questions

For now, I coerced native types to their primitive equivalents (for example, LWEPlaintext is represented using a number). Would it be more secure to add a wrapper type such that JS never has direct access to the LWECiphertext value?

TODO

Parse enums using https://emscripten.org/docs/porting/connecting_cpp_and_javascript/embind.html#enums