Split core module to serialization and plutus annotation

[satran004]

Currently, core module contains classes with different functionalities. There is an opportunity to split core into multiple modules

1. serialization/spec/or a better name (Module with serialization logic)
2. Plutus annotation (Module with plutus annotations and converters). We may call this module plutus-helper/plutus-extra to increase the scope of this module.
3. core (Remaining functionalities)

Note:

• As serialization code is used everywhere in CCL and also application code, we should not change the package name in serialization module.