[GA4GH] Implement Data Connect endpoints

[victorskl]

Context:

• Study SPEC at https://github.com/ga4gh-discovery/data-connect
• See pseudocode hypothetical API Request/Response flow at https://umccr.slack.com/archives/CP356DDCH/p1639111807177900

Motivation:

• To facilitate Portal & Pipeline models data discovery in standardise way...

Actions:

• Explore

[victorskl]

• Portal & Pipeline data model can now be queried through Portal Athena setup

• From https://github.com/ga4gh/cohort-rep-hackathon#data-connect hackathon activity, I learnt that Data Connect Trino implementation

[Trino](https://en.wikipedia.org/wiki/Presto(SQL_queryengine)) is Presto; Presto is Athena!

• Hence, GA4GH Data Connect endpoints can be backed by Portal Athena that comes with Kinkalow release.

[victorskl]

See https://github.com/ga4gh/fasp-scripts/issues/29 for DataConnect client SDK and examples

[victorskl]

Descope from 2.0 release for now due to other priority