k8s: keep-test configuration for keep-client nodes

[nkuba]

Refs https://github.com/keep-network/keep-core/issues/3012

This PR contains the configuration of clients running in keep-test environment for Goerli network.

There are 10 nodes running with 20 x minimum stake each. Logs: https://cloudlogging.app.goo.gl/XJdJ4D3S2sVQwFJ88

Configuration for nodes is generated with ytt. To generate the config run ./gen.sh script.

YTT configuration consists of 3 files:

• template.yaml - template for kubernetes YAML configuration generation
• schema.yaml - defines default properties values
• data.yaml - defines values for clients for config generation