otelconf: add test files for rc2

This adds the v1.0.0-rc.2 test yaml from the config repo: https://github.com/open-telemetry/opentelemetry-configuration/blob/main/examples/kitchen-sink.yaml and also adds the json translation of that yaml file.

To reviewers, I downloaded the file from the configuration schema repo and put it in the testdata folder. I then pasted the yaml into an online translation tool to produce the json.

Part of splitting open-telemetry#8026

Signed-off-by: alex boten <[email protected]>

Author: codeboten