[Fix] no-restricted-paths: enhance performance for exceptions

[malykhinvi]

Main changes
Move exceptions paths resolution and validation to rule create phase.

Background
There was a performance downgrade if zone had except option defined. On every import every relative exception path had to be resolved to absolute path and validated. See a corresponding issue #1758

Results
On our SPA we have a lot of zones with exceptions. It turned out that this simple change gives us almost 10 times better performance. Measured with TIMING=1 eslint on our project.

Before:

Rule                                    | Time (ms) | Relative
:---------------------------------------|----------:|--------:
import/no-restricted-paths              | 94633.358 |    72.2%
@typescript-eslint/no-floating-promises | 18576.419 |    14.2%
react/no-multi-comp                     |  4629.594 |     3.5%
@typescript-eslint/no-redeclare         |  2634.454 |     2.0%
lodash/callback-binding                 |  1272.849 |     1.0%
@typescript-eslint/naming-convention    |  1209.871 |     0.9%
lodash/collection-return                |   885.415 |     0.7%
lodash/no-unbound-this                  |   669.923 |     0.5%
lodash/collection-method-value          |   668.716 |     0.5%
lodash/no-extra-args                    |   569.119 |     0.4%

After:

Rule                                    | Time (ms) | Relative
:---------------------------------------|----------:|--------:
@typescript-eslint/no-floating-promises | 18438.043 |    40.6%
import/no-restricted-paths              |  8910.373 |    19.6%
react/no-multi-comp                     |  4617.370 |    10.2%
@typescript-eslint/no-redeclare         |  2697.734 |     5.9%
lodash/callback-binding                 |  1282.186 |     2.8%
@typescript-eslint/naming-convention    |  1177.818 |     2.6%
lodash/collection-return                |   885.509 |     1.9%
lodash/collection-method-value          |   727.829 |     1.6%
lodash/no-unbound-this                  |   681.466 |     1.5%
lodash/no-extra-args                    |   606.288 |     1.3%

[coveralls]

Coverage increased (+13.0%) to 84.048% when pulling 17a445d on malykhinvi:master into 359b6e5 on benmosher:master.

[ljharb]

Thanks, seems reasonable!