Add serde interfaces

[pditommaso]

Draft implementation for a generic ser-deserialization mechanism for CID model.

Inspired to https://github.com/seqeralabs/wave/blob/77bbb416e8ff2101a8ede397049c5022d1f1d1b1/src/main/groovy/io/seqera/wave/encoder/MoshiEncodeStrategy.groovy#L46-L46

[jorgee]

Update:

• Changes in the CidObserver, CidOperationImpl, and CidPath to support the new interface.
• Restrict the encoder interface to encode/decode CidSerializable objects.
• Fix tests

Note: I have restricted the encoder interface because for CIDs we do not need a generic input type. Also when loading the object from the CidStore in CidPath or the CidOperationImpl classes, we don't know the exact model class that we expected, it is only known data is retrieved and the type field is inspected, we only know they are CidSerializable and the Groovy's JsonSlurper was not able to cast to an interface. So, I needed to add something to manage the polymorphism. Currently, I have implemented a simple mechanism in the decode method including in the DataType enum the class to cast the retrieved object. We could manage more generically with Moshi Adapters as done in Wave but we must add a new dependency and it is not required for the Cid case. I can do it later if we want to create a generic encoder to be used in other part in Nextflow.

[pditommaso]

Just update the cid-store branch, let's solve the conflicts

[pditommaso]

Went ahead with the suggestion for a generic serde. Main changes:

• Move the base encoder interface and logic in nf-commons
• Implement a json encoder based on Gson that's already included in the nextflow base classpath
• Refactor CidEncoder based on GsonEncoder
• Remove the need for an *explicit* type field CID model objects.
• Use consistently CidEncoder in place of JsonOutput.

[jorgee]

Everything works as expected. I have just renamed the test class JsonEncoderTest to CidEncoderTest to match with the refactor. Ready to merge to cid-store from my side. Once merged, I will update the annotations PR