[resolvers/webpack] [new] add cache option

[seiyab]

Resolves #2746 to me.

eslint-import-resolver-webpack evaluates function config at every resolution. If it costs, this parameter helps.

with main branch:

Rule                 | Time (ms) | Relative
:--------------------|----------:|--------:
import/extensions    | 23930.926 |    83.4%
import/no-duplicates |  4757.780 |    16.6%

with this branch:

Rule                 | Time (ms) | Relative
:--------------------|----------:|--------:
import/extensions    |  3020.711 |    72.5%
import/no-duplicates |  1143.149 |    27.5%

I'm worrying whether we should add test in 608e81e or not. We can instantly add it reverting the commit.

[codecov]

Codecov Report

Attention: Patch coverage is 14.28571% with 12 lines in your changes missing coverage. Please review.

Project coverage is 95.22%. Comparing base (67cc798) to head (fa676dd).

Files with missing lines	Patch %	Lines
resolvers/webpack/index.js	14.28%	12 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #3100       +/-   ##
===========================================
+ Coverage   81.99%   95.22%   +13.23%     
===========================================
  Files          94       83       -11     
  Lines        4154     3584      -570     
  Branches     1395     1252      -143     
===========================================
+ Hits         3406     3413        +7     
+ Misses        748      171      -577     

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[ljharb]

Seems pretty good!