Use Map for rule search and add benchmark

[lupomontero]

This PR includes the changes proposed by @gugu's in #302 as well as on other minor tweaks (like only iterating over the rules once instead of twice on module load).

This increases performance (ops/sec) by a factor of over 100!!

The main change is using a Map object and indexing it by punySuffix. This allows searching by punySuffix without having to iterate over the thousands of rules.

npm run benchmark

> [email protected] benchmark
> node --experimental-vm-modules --no-warnings benchmark/suite.js

┌────────────────────────────────────┬─────────┬──────┬──────────────┐
│ (index)                            │ ops/sec │ ± %  │ runs sampled │
├────────────────────────────────────┼─────────┼──────┼──────────────┤
│ [source] psl#isValid               │ 367385  │ 3.76 │ 85           │
│ [source] psl#parse                 │ 396952  │ 1.22 │ 93           │
│ [source] psl#parse invalid domain  │ 429242  │ 1.25 │ 92           │
│ [v1.13.0] psl#isValid              │ 3306    │ 1.62 │ 87           │
│ [v1.13.0] psl#parse                │ 3402    │ 2.07 │ 89           │
│ [v1.13.0] psl#parse invalid domain │ 3230    │ 1.53 │ 87           │
└────────────────────────────────────┴─────────┴──────┴──────────────┘
┌──────────────────────────┬────────┬─────────┬──────────────┐
│ (index)                  │ source │ v1.13.0 │ diff         │
├──────────────────────────┼────────┼─────────┼──────────────┤
│ psl#isValid              │ 367385 │ 3306    │ '111.13x up' │
│ psl#parse                │ 396952 │ 3402    │ '116.68x up' │
│ psl#parse invalid domain │ 429242 │ 3230    │ '132.89x up' │
└──────────────────────────┴────────┴─────────┴──────────────┘