Performance: Sigverify Tx

[bw-solana]

The current sigverify limits incoming batches to 5k packets. This constrains things to ~125k TPS (~40ms per iteration) on typical HW. Current sigverify implementation can be scaled to ~200k TPS just by increasing max batch size.

Port AVX-512 implementation from Firedancer, should be ~2x performance increase per core through sigverify

We can also avoid doing some amount of sigverify by feeding some minimum PF from banking stage → QUIC fetch and filtering out transactions of low value before wasting time sigverifying and filtering them. We need the txview #2255 changes to be able to quickly and efficiently parse transactions and extract the PF.

• ed25519_verify_cpu: remove allocation in hot path #3941
• v2.1: ed25519_verify_cpu: remove allocation in hot path (backport of #3941) #3945