Add scalar ops, bitshift, min/max (#130)

* feat(tfhe): add support for casting

* feat: add `cast` precompile

* feat(tfhe): add `&`, `|`, `^`, `==`, `>`, `>=`

* feat(precompiles): add missing ops

* feat(precompiles): add tests

* fix: add precompile contract addresses

* fit(precompiles): change precompile order

* feat(tfhe): add scalar ops

* fix(tfhe): add `isValid` for ciphertext types

* fix(tfhe): check type validity

* feat(contracts): add fhe operators

* fix(test): restore deserialize failure test