Support arrays for included & excluded in custom rules

[marcelofabri]

In certain cases, it's easier to specify multiple patterns than combining everything in one.

[SwiftLintBot]

	12 Messages
📖	Linting Aerial with this PR took 0.98s vs 0.98s on master (0% slower)
📖	Linting Alamofire with this PR took 1.09s vs 1.1s on master (0% faster)
📖	Linting Firefox with this PR took 4.35s vs 4.34s on master (0% slower)
📖	Linting Kickstarter with this PR took 7.54s vs 7.55s on master (0% faster)
📖	Linting Moya with this PR took 0.57s vs 0.53s on master (7% slower)
📖	Linting Nimble with this PR took 0.41s vs 0.41s on master (0% slower)
📖	Linting Quick with this PR took 0.19s vs 0.18s on master (5% slower)
📖	Linting Realm with this PR took 9.94s vs 9.94s on master (0% slower)
📖	Linting SourceKitten with this PR took 0.34s vs 0.34s on master (0% slower)
📖	Linting Sourcery with this PR took 2.04s vs 2.03s on master (0% slower)
📖	Linting Swift with this PR took 3.42s vs 3.41s on master (0% slower)
📖	Linting WordPress with this PR took 8.1s vs 8.08s on master (0% slower)

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[SimplyDanny]

Looks good. I have one remark regarding tests, though:

[codecov-commenter]

Codecov Report

Merging #4006 (eb1ef78) into master (04972a3) will decrease coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4006      +/-   ##
==========================================
- Coverage   92.55%   92.43%   -0.12%     
==========================================
  Files         446      447       +1     
  Lines       22492    22605     +113     
==========================================
+ Hits        20817    20896      +79     
- Misses       1675     1709      +34     

Impacted Files	Coverage Δ
.../Rules/RuleConfigurations/RegexConfiguration.swift	91.02% <100.00%> (+2.31%)	⬆️
...e/SwiftLintFramework/Rules/Style/CustomRules.swift	100.00% <100.00%> (ø)
...sts/SwiftLintFrameworkTests/CustomRulesTests.swift	94.04% <100.00%> (+0.25%)	⬆️
...ftLintFrameworkTests/RegexConfigurationTests.swift	100.00% <100.00%> (ø)
...ork/Rules/Idiomatic/UnavailableConditionRule.swift	4.16% <0.00%> (-6.95%)	⬇️
Source/SwiftLintFramework/Models/Linter.swift	82.77% <0.00%> (-1.67%)	⬇️
...iftLintFramework/Extensions/String+SwiftLint.swift	90.00% <0.00%> (-0.91%)	⬇️
...SwiftLintFrameworkTests/StringExtensionTests.swift	100.00% <0.00%> (ø)

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