perf(check): use v8 code cache for extension sources in deno check

[nathanwhit]

In particular this helps startup of the TSC isolate because 00_typescript.js can use the code cache.

Overall, this offsets a fair bit of the hit we took when we removed the TSC snapshot.

❯ hyperfine --warmup 5 -p "rm -rf ~/Library/Caches/deno/check_cache_v2" "./deno-this-pr check main.ts" "./deno-no-snapshot check main.ts" "./deno-with-snapshot check main.ts"
Benchmark 1: ../../deno/target/release-lite/deno check main.ts
  Time (mean ± σ):     145.7 ms ±   3.6 ms    [User: 347.6 ms, System: 36.9 ms]
  Range (min … max):   142.2 ms … 155.9 ms    19 runs

Benchmark 2: ./deno-no-snapshot check main.ts
  Time (mean ± σ):     195.4 ms ±   3.3 ms    [User: 397.7 ms, System: 34.9 ms]
  Range (min … max):   192.1 ms … 206.0 ms    15 runs

Benchmark 3: ./deno-with-snapshot check main.ts
  Time (mean ± σ):     109.0 ms ±   2.2 ms    [User: 155.9 ms, System: 19.3 ms]
  Range (min … max):   106.5 ms … 118.0 ms    26 runs

Summary
  ./deno-with-snapshot check main.ts ran
    1.34 ± 0.04 times faster than ./deno-this-pr check main.ts
    1.79 ± 0.05 times faster than ./deno-no-snapshot check main.ts