Generate toString() without newline characters

[nazlo]

Whenever java entities are generated, corresponding toString() method is also generated. The issue is: generated toString() uses \n characters in it. If a client wants to use generated entities in log statements, then the particular statement is spread across multiple lines.
This makes impossible logs indexing with elastic search or aws cloud watch.

I suggest to

1. Remove toString() generation
2. Add annotation @lombok.Data on each java entity
3. Add lombok as compileOnly dependency for helium-java