Introduce ZIO SQL "driver" interface

[jdegoes]

The ZIO SQL driver interface will have:

• select
• deleteFrom
• update
• insert

and, possibly in the future, DDL.

These will return ZIO effects or ZIO streams, as appropriate.

This is expected to be a lightweight project at the top-level, on which JDBC / etc. projects will depend to expose CRUD functionality atop the core SQL query data model.

[jdegoes]

This is partially implemented. We have to figure out whether or not to combine the ReadExecutor / etc. interfaces into a single interface, or keep them separate.

[phderome]

note for insert. returning clause returning data to caller should be supported. See for example https://mariadb.com/kb/en/insertreturning/#:~:text=Description-,INSERT%20...,alternatively%2C%20the%20specified%20SELECT%20expression.

Postgres doc: https://www.postgresql.org/docs/9.5/sql-insert.html

quote:

Insert a single row into table distributors, returning the sequence number generated by the DEFAULT clause:

INSERT INTO distributors (did, dname) VALUES (DEFAULT, 'XYZ Widgets')
   RETURNING did;
Increment the sales count of the salesperson who manages the account for Acme Corporation, and record the whole updated row along with current time in a log table:

WITH upd AS (
  UPDATE employees SET sales_count = sales_count + 1 WHERE id =
    (SELECT sales_person FROM accounts WHERE name = 'Acme Corporation')
    RETURNING *
)
INSERT INTO employees_log SELECT *, current_timestamp FROM upd;

[sviezypan]

Mostly implemented, rest is in the issue #596