Add ERC-2494 compliant BabyJubJub

[vasemkin]

Description

This PR builds upon the work by @Shigoto-dev19 in the archived arkworks-rs/curves repository. Please see the relevant discussions.

• Added a Circom compatible Baby Jubjub elliptic curve according to ERC-2494
  • The literature test cases are verified(not explicitly added in order to respect the architecture!).
  • The architecture is kept the same as the other Twisted Edwards curves by arkworks-rs/curves.

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• Targeted PR against correct branch (master)
• Linked to GitHub issue with discussion and accepted design OR have an explanation in the PR that describes this work.
• Wrote unit tests
• Updated relevant documentation in the code
• Added a relevant changelog entry to the Pending section in CHANGELOG.md
• Re-reviewed Files changed in the GitHub PR explorer