perf(pnp): reduce work done at runtime

[merceyz]

What's the problem this PR addresses?

The PnP runtime is doing a decent chunk of unnecessary work

How did you fix it?

• Cache decompression result in ZipFS
• Cache realPath result in ZipOpenFS
• throttle refreshApiEntry

Result
When I tested this on #1669 just perf(fslib): get real path from ZipFS in ZipOpenFS alone reduces the build time from 2m28.568s to 1m34.816s (~54 seconds faster) (cc @alubbe)

Tested using

require('./.pnp.js').setup();
const { performance } = require('perf_hooks');

const start = performance.now();
for (let i = 0; i < 10000; i++) {
	require.resolve('typescript');
}
const end = performance.now();

console.log(end - start, 'ms');

	time
master	7318ms
perf(fslib): cache decompression result	5235ms
perf(fslib): get real path from ZipFS in ZipOpenFS	2019ms
perf(pnp): throttle refreshApiEntry	1437ms

Checklist

• I have read the Contributing Guide.
• I have set the packages that need to be released for my changes to be effective.
• I have verified that all automated PR checks pass.

[alubbe]

Thanks @merceyz - this is awesome!