POC graphql API to aggregate data from various data sources

[formuzi]

Instead of using data collector to watch the resource and push to k-atlas entity API, there is another approach is to actively fetch data based on the query.

graphql is designed to solve this problem. This is to have a POC to build such API using graphql.

[fzxu]

After compared with several different graghsql implementation in golang and this https://gqlgen.com/feature-comparison/

The winner is https://github.com/99designs/gqlgen