Add mumak to Builder Tools

[Mercurial]

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1. Please complete a Checklist
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3. Click "Create pull request"

Checklist

<-- Please fill the boxes with [x] before submitting a pull request -->

• [x] I have read the How to Contribute.
• [x] I have read the Builder Tool Requirements
• [x] I have run yarn build after adding my changes without getting any errors.

Builder Tool addition

<-- Provide information for every bullet in the list below. The tags you select must match the tags in your changes to the builder-tools.js -->

• Title: Mumak
• Description: A custom PostgreSQL extension to interact with Cardano CBOR data directly.
• Website: Github
• Getstarted: Install
• Tags:
  • rust
  • chainindex
  • sql
  • lowlevel