Speeds up the caching part of this arbitrary `"nodeModulesDir": "auto"`
project by about 22%
We write the tags associated with a given npm package to the
`.initialized` file, so that byonm can correctly resolve tags. When
setting up the node modules dir, we read that file to see if we need to
update the tags.
If we don't have any tags associated with the package though, we can
just check for existence (which is a fair bit faster than trying to
`open` + `read` a file).
```
❯ hyperfine --warmup 3 "deno check src/**/*.ts" "../deno/target/release-lite/deno check src/**/*.ts"
Benchmark 1: deno check src/**/*.ts
Time (mean ± σ): 369.9 ms ± 5.5 ms [User: 286.9 ms, System: 128.9 ms]
Range (min … max): 361.7 ms … 377.7 ms 10 runs
Benchmark 2: ../deno/target/release-lite/deno check src/**/*.ts
Time (mean ± σ): 303.5 ms ± 5.9 ms [User: 210.9 ms, System: 124.5 ms]
Range (min … max): 292.7 ms … 315.0 ms 10 runs
Summary
../deno/target/release-lite/deno check src/**/*.ts ran
1.22 ± 0.03 times faster than deno check src/**/*.ts
```
Extracted out of https://github.com/denoland/deno/pull/27838/files
Reduces some allocations by accepting either a pathbuf or url for the
referrer for resolution and returning either a pathbuf or url at the
end, which the caller can then convert into to their preferred state.
This is about 4% faster when still converting the final result to a url
and 6% faster when keeping the result as a path in a benchmark I ran.
