use maps for rule search, add benchmark

[gugu]

Problem:

There are 9000 rules and to check domain validity we need to iterate over them. It is hard to use map because we need to search by substring, performance O(domainsCount * ruleCount)

Solution:

1. Added benchmark.js checks to get observability
2. During module load we process punySuffix for every domain. It is a very cheap operation O(ruleCount)
3. During module load we create a map suffix => [rule1, rule2, ..], which usually has 1 element O(ruleCount)
4. During search we split the domain by dots and search in the map. O(1)

E.g. for mysubdomain.google.co.uk:

1. search rule map for mysubdomain.google.co.uk => nothing
2. search rule map for google.co.uk => nothing
3. searching rule map for .co.uk => found
4. returting rule for .co.uk

Fixes #301

[lupomontero]

Hi @gugu, I've finally had the opportunity to review this in depth and overall the changes are awesome 🎖️. The performance inmprovement is huge (over 100x) 🤯.

Since the PR was a bit outdated, I have rebased your branch and created a new PR, adding a few more tweaks. See #334

[lupomontero]

Closing this PR as these changes will be merged via #334