Iter8 examples showcasing load testing with slo validation using GH actions

[atinsood]

Contribute to the existing http example with github actions. the current example explains how to leverage iter8 along with GH actions to carry out load testing with slo validation

We are looking for contributions to provide examples showcasing: - grpc example with GH actions to carry out load testing with slo validation - ssl example with GH actions to carry out load testing with slo validation - more realistic workloads

Contributions can be in terms of:

1. kui guidebooks(preferred)
2. documentation examples
3. code examples with more workloads