feat: add NEON support on arm64

llhttp benchmarks on M2 mac. Before: url (C) 8192.00 mb | 2190.59 mb/s | 44173087.93 ops/sec | 3.74 s http: "seanmonstar/httparse" (C) 8192.00 mb | 1756.10 mb/s | 2619357.05 ops/sec | 4.66 s http: "nodejs/http-parser" (C) 8192.00 mb | 1467.88 mb/s | 2959960.95 ops/sec | 5.58 s After this commit: url (C) 8192.00 mb | 2234.10 mb/s | 45050377.93 ops/sec | 3.67 s http: "seanmonstar/httparse" (C) 8192.00 mb | 2864.38 mb/s | 4272436.75 ops/sec | 2.86 s http: "nodejs/http-parser" (C) 8192.00 mb | 1936.36 mb/s | 3904664.31 ops/sec | 4.23 s cc @mcollina @nodejs/llhttp