Add configuration for NestingRule

[sora0077]

Implements #1318

[SwiftLintBot]

	12 Messages
📖	Linting WordPress-iOS with this PR took 16.84s vs 17.0s on master (0% faster)
📖	Linting swift with this PR took 15.92s vs 15.32s on master (3% slower)
📖	Linting Aerial with this PR took 0.55s vs 0.56s on master (1% faster)
📖	Linting SourceKitten with this PR took 1.7s vs 1.62s on master (4% slower)
📖	Linting Sourcery with this PR took 3.75s vs 3.54s on master (5% slower)
📖	Linting ios-oss with this PR took 23.52s vs 22.36s on master (5% slower)
📖	Linting Alamofire with this PR took 4.44s vs 4.61s on master (3% faster)
📖	Linting firefox-ios with this PR took 25.39s vs 24.06s on master (5% slower)
📖	Linting Nimble with this PR took 2.65s vs 2.44s on master (8% slower)
📖	Linting Quick with this PR took 0.78s vs 0.76s on master (2% slower)
📖	Linting realm-cocoa with this PR took 4.05s vs 3.89s on master (4% slower)
📖	Linting Moya with this PR took 0.57s vs 0.55s on master (3% slower)

Generated by 🚫 danger

[codecov-io]

Codecov Report

Merging #1340 into master will decrease coverage by -0.02%.
The diff coverage is 82.6%.

@@            Coverage Diff             @@
##           master    #1340      +/-   ##
==========================================
- Coverage   81.93%   81.92%   -0.02%     
==========================================
  Files         170      171       +1     
  Lines        8660     8720      +60     
==========================================
+ Hits         7096     7144      +48     
- Misses       1564     1576      +12

Impacted Files	Coverage Δ
Source/SwiftLintFramework/Rules/NestingRule.swift	100% <100%> (ø)	✅
...ules/RuleConfigurations/NestingConfiguration.swift	77.77% <77.77%> (ø)
...iftLintFrameworkTests/RuleConfigurationTests.swift	77.27% <81.81%> (+0.59%)	✅

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[jpsim]

Excellent work! 👏