Check in both pg and mysql schema in src code

[sadhansood]

Description

This PR allows us to checkin schema for both postgres and mysql at the same time in the source code and switch between the two based on config feature.

Test plan

cargo clippy

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[gegaowp]

LG do we still need schema.rs under src?

[sadhansood]

LG do we still need schema.rs under src?

No, we shouldn't need it anymore. It is getting replaced with pg.rs