* [java-micronaut] Generate visitor for subtypes with a discriminator
When types which extend a common type and are distinguished based on a
discriminator are consumed they are often cast to their specific Java
type which results in error prone boilerplate code.
By generating a visitor for those kind of types the various subtypes can
be consumed in a type safe manner.
* [java-micronaut] Remove redundant public access modifiers
* Add micronaut server implementation
* Add micronaut server tests and imporovements
* Generate samples, docs and verify that tests pass
* Update micronaut docs and samples after merging with master
* Update micronaut dev server samples
* Add micronuat server docs
* Update micronaut version
* Minor changes to micronaut server and client
* Fix documentation generation in samples
Co-authored-by: Andriy Dmytruk <andriy.dmytruk@andriy.dmytruk.ca.oracle.com>
* Create initial version of openapi micronaut generator
* Update validation, authorization, query parameters and time format
* Move micronaut to its own generator
* Add micronaut documentation
* Refactor and add tests to JavaMicronautClientGenerator
* Refactor model mustache for micronaut client
* Refactor model enum and pojo mustache files for micronaut client
* Move micronaut client generation to micronaut 3.0.0-M5 version
* Generate samples for micronaut client
* Add hidden files of generated samples for micronaut client
* Add and configure micronaut tests as maven profile
* Add option to choose between junit and spock for micronaut client generator
* Add tests for micronaut 'build' and 'test' options; regenerate micronaut samples
