bench: make benchmarks a bit more useful

[UdjinM6]

Add serialization benchmarks, use BasicSchemeMPL in existing benchmarks, drop irrelevant ones

Results (m1 pro)

Signing
Total: 5000 runs in 3835 ms
Avg: 0.767 ms

Verification
Total: 1000 runs in 2527 ms
Avg: 2.527 ms

Batch verification preparation
Total: 10000 runs in 8786 ms
Avg: 0.8786 ms

Public key validation
Total: 10000 runs in 1896 ms
Avg: 0.1896 ms

Signature validation
Total: 10000 runs in 2048 ms
Avg: 0.2048 ms

Aggregation
Total: 10000 runs in 20 ms
Avg: 0.002 ms

Batch verification
Total: 10000 runs in 11056 ms
Avg: 1.1056 ms

Serialize PrivateKey
Total: 5000000 runs in 134 ms
Avg: 2.68e-05 ms

Serialize G1Element
Total: 5000000 runs in 1036 ms
Avg: 0.0002072 ms

Serialize G2Element
Total: 5000000 runs in 1541 ms
Avg: 0.0003082 ms

SerializeToArray PrivateKey
Total: 5000000 runs in 61 ms
Avg: 1.22e-05 ms

SerializeToArray G1Element
Total: 5000000 runs in 936 ms
Avg: 0.0001872 ms

SerializeToArray G2Element
Total: 5000000 runs in 1444 ms
Avg: 0.0002888 ms

[PastaPastaPasta]

utACK 90fd986

[kwvg]

ACK 90fd986