Wrap alcotest suites with Alcotezt Q2

This issue tracks the migration of existing alcotest suites into alcotez

• src/lib_bls12_381_signature/test (@lykimquyen !8584 (closed)), (@abate !8878 (merged))
• src/lib_bls12_381_hash/test (@lykimquyen, !8585 (merged))
• src/lib_mec/test (@lykimquyen, !8587 (merged))
• src/lib_srs_extraction/test (@lykimquyen, !8655 (merged))
• src/lib_mec / src/lib_plonk / src/lib_epoxy : !8930 (closed) @abate