Created a reactive kubernetes openapi client using reactor

[msupic]

Modifications:

• created kubernetes-client-openapi-common module and copied all files from kubernetes-client-openapi module to the new module (didn't modify package names so there are no breaking changes)
• modified kubernetes-client-openapi module to depends on kubernetes-client-openapi-common module
• created kubernetes-client-openapi-reactor module for reactive client implementation (also depends on kubernetes-client-openapi-common module)
• modified KubernetesHttpClientFilter to not be executed on netty event loop thread
• created internal gradle plugin which downloads OpenApi spec from the official Java client library for Kubernetes
• updated docs

Implementation details:

• kubernetes-client-openapi-common module creates only model classes from kubernetes openapi spec so those can be shared between different api implementations
• kubernetes-client-openapi module creates only blocking api classes from kubernetes openapi spec and uses model classes from kubernetes-client-openapi-common module
• kubernetes-client-openapi module creates only reactive api classes from kubernetes openapi spec and uses model classes from kubernetes-client-openapi-common module

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
67.1% Coverage on New Code (required ≥ 70%)
2 New Bugs (required ≤ 0)

See analysis details on SonarQube Cloud

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