init passkey pallet

[aramikm]

Goal

The goal of this PR is create an empty pallet for passkey

Closes #2026

Checklist

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

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 50.00000% with 6 lines in your changes missing coverage. Please review.

Files	Coverage Δ
pallets/passkey/src/lib.rs	50.00% <50.00%> (ø)