Move away from `protolude` and create our own `Prelude`

[taimoorzaeem]

Problem

Considering #1804 (comment) and #1804 (comment), we should work on our own Prelude module/library.

Solution

Have a Prelude library/module with similar design points as protolude. We can add to it our own utility functions to it (e.g. composed hasql encoder/decoder functions as observed in #4297 (comment)).