✨ New Election context endpoint, remove description endpoint - #101

Issue

Closes #100
Closes #97

Description

🔥 Removes the /api/v1/election/description endpoint

✨ New mediator endpoint:
POST /api/v1/election/context

Request

{
  "description": {/* standard election description */},
  "elgamal_public_key": "<result of combining public keys>",
  "number_of_guardians": 5,
  "quorum": 3
}

Response

{
    "crypto_base_hash": "<base hash>",
    "crypto_extended_base_hash": "<extended base hash>",
    "description_hash": "<description hash>",
    "elgamal_public_key": "<public key from the request>",
    "number_of_guardians": 5,
    "quorum": 3
}

Testing

Added a test to Postman

Checklist

🚨Please review the guidelines for contributing to this repository.

• 🤔 CONSIDER adding a unit test if your PR resolves an issue.
• ✅ DO check open PR's to avoid duplicates.
• ✅ DO keep pull requests small so they can be easily reviewed.
• ✅ DO build locally before pushing.
• ✅ DO make sure tests pass.
• ✅ DO make sure any new changes are documented.
• ✅ DO make sure not to introduce any compiler warnings.
• ❌AVOID breaking the continuous integration build.
• ❌AVOID making significant changes to the overall architecture.

💙 Thank you!