[perf] move match producing to worker thread

[ast-grep]

[perf] move match producing to worker thread

[HerringtonDarkholme]

Some perf try:

Running match in worker:

./target/release/sg -p '$P && $P()' -r '$P?.()' ../TypeScript/src 1.89s user 0.08s system 489% cpu 0.403 total
./target/release/sg -p '$P && $P()' -r '$P?.()' ../TypeScript/ 38.84s user 2.14s system 652% cpu 6.276 total

Running match in main:
./target/release/sg -p '$P && $P()' -r '$P?.()' ../TypeScript/src 1.90s user 0.08s system 501% cpu 0.395 total
./target/release/sg -p '$P && $P()' -r '$P?.()' ../TypeScript/ 39.44s user 2.61s system 671% cpu 6.265 total

[HerringtonDarkholme]

However, running scan in worker will be much faster than in main thread.

sg scan in TypeScript will only utilize about 170% of CPU.