add script and now.sh function to edit pg_dump output (close #1861)

[shahidhk]

Description

This PR adds a bash script and a serverless function to clean up the output of pg_dump so that it can be used as a migration file for Hasura. This can be later integrated with the CLI so that the cleanup is handled by CLI.

Affected components

• Scripts

Related Issues

#1861

Solution and Design

• A serverless function written in Go gets the SQL content though HTTP POST.
• A set of pre-defined lines are removed from this SQL string.
• SQL comments are removed using regex matching.
• Postgres triggers created by Hasura for use with event triggers are removed with regex matching.
• Empty newlines are removed by regex matching.
• Resulting string is returned in the HTTP response.

Steps to test and verify

curl --data-binary @filename.sql https://hasura-edit-pg-dump.now.sh > newfile.sql

Limitations, known bugs & workarounds

NA

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