Update VRF specs and vectors

[prasad-kumkar]

• update suite constants, transcript primitives, and curve configs for Tiny, Thin, Pedersen, and Ring VRF schemes
• add batch verification and explicit Ring setup/context helpers
• add BN254 PCS support for Baby-JubJub ring vectors
• refresh cross-suite vectors and generate dot-ring vectors for external verification
• update benchmark docs and naming

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 217 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
dot_ring/ring_proof/pcs/bn254_serialization.py	44.26%	34 Missing ⚠️
dot_ring/ring_proof/pcs/bn254_kzg.py	84.05%	22 Missing ⚠️
dot_ring/vrf/vrf_protocol.py	0.00%	14 Missing ⚠️
dot_ring/curve/point.py	27.77%	13 Missing ⚠️
dot_ring/ring_proof/constraints/constraints.py	86.74%	11 Missing ⚠️
dot_ring/curve/twisted_edwards/te_affine_point.py	23.07%	10 Missing ⚠️
dot_ring/curve/specs/p256.py	85.00%	9 Missing ⚠️
dot_ring/ring_proof/params.py	90.42%	9 Missing ⚠️
dot_ring/curve/specs/bandersnatch_sw.py	69.23%	8 Missing ⚠️
dot_ring/vrf/ring/ring_batch_verifier.py	80.00%	8 Missing ⚠️
... and 25 more

📢 Thoughts on this report? Let us know!