Fix asymmetric serialization in JacksonStateSerDes

[Toseban]

using the normal encoder and then the urldecoder leads to errors like "Illegal base64 character 2f" when encoding more complex urls

[CLAassistant]

All committers have signed the CLA.

[sdelamo]

@Toseban can you add a test?

[Toseban]

@sdelamo I added a test but did not manage to make the project tests run locally.

[sdelamo]

@sdelamo I added a test but did not manage to make the project tests run locally.

what do you mean? You can build the project locally with ./gradlew build. We need every committer to sign the CLA.