Added kryo setter method in Builder class

[anoop44]

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[nhachicha]

Hi @anoop44
Thanks for the PR,
this is good but obviously this will override any previously registered Kryo instance (example)

we need to find a good trade-off between the two operations

[anoop44]

Hi @nhachicha

Thats Right. My concern was there was no option to set Defaualt Serializer in Builder. So I thought instead of just adding a setter method for DefaultSeriazer, it would be better to set kryo itself. So that user can have much customized kryo for them.