Add u5c to Builder Tools

[Mercurial]

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Checklist

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• [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: UTxORPC
• Description: UTxORPC (u5c for short) is a gRPC interface for UTxO Blockchains, Interact with UTxO-based blockchains using a shared specification with focus on developer experience and performance.
• Website: https://utxorpc.org/
• Getstarted: https://utxorpc.org/introduction
• Tags:
  • chainindex
  • lowlevel
  • http
  • websocket
  • json