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### Description
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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
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- Scripts
### Related Issues
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#1861
### Solution and Design
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- 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
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```bash
curl --data-binary @filename.sql https://hasura-edit-pg-dump.now.sh > newfile.sql
```
### Limitations, known bugs & workarounds
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NA
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