What this commit has achieved:
1. Created some functions to generate views
2. Inspired by
https://stackoverflow.com/a/35179515,
https://stackoverflow.com/a/54290549,

and the motivation to do so by
https://ellisvalentiner.com/post/2022-01-06-flattening-json-in-postgres/
3. TODO maybe add these scripts into the MyBatis migrations

What this commit has achieved:
1. Add `client_detailed_view` for OpenSRP-Client-ANC

What this commit has achieved:
1. Created a function to create jsonb flat view with capability of flattening nested object(s)

What this commit has achieved:
1. Reorder the nested column names
2. Deselect root property `obs`, as the flat array already selected

What this commit has achieved:
1. Deselect column `e."json"->>'details' "details"` because flattened already.

https://www.notion.so/sid-levi/SysAdmin-Automate-generate_all_event_type_views-of-Bunda-App-data-0db0372bcb824c5595f2780f85202da3

What this commit has achieved:
1. Removed all "ORDER BY" in the view, let user to order lastly
2. Created indexes to optimize the query plan

https://www.notion.so/sid-levi/SysAdmin-Automate-generate_all_event_type_views-of-Bunda-App-data-0db0372bcb824c5595f2780f85202da3

What this commit has achieved:
1. Removed `opensrp-client-anc_client-detailed-view.sql`
2. Can use `create_jsonb_nested_flat_view` function to achieve the same
```
core.create_jsonb_nested_flat_view(
    'client',
    'id, date_deleted, server_version',
    'json',
    'identifiers', 'attributes'
);
```