passkeys: check p256 signature

[aramikm]

Goal

The goal of this PR is check p256 Passkey signatures validations.

Closes #2028

Checklist

• [X] Chain spec updated
• [X] Tests added
• [X] Benchmarks updated
• [X] Weights updated

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 90.82569% with 10 lines in your changes missing coverage. Please review.

Files	Coverage Δ
pallets/frequency-tx-payment/src/lib.rs	82.87% <100.00%> (ø)
pallets/passkey/src/test_common.rs	100.00% <100.00%> (ø)
pallets/passkey/src/lib.rs	94.92% <97.36%> (-0.08%)	:arrow_down:
pallets/passkey/src/types.rs	68.75% <82.35%> (+23.92%)	:arrow_up: