Use SourceKit to validate associatedtype and typealias in type_name rule when linting with Swift 4.1

[marcelofabri]

Part of #2021

[SwiftLintBot]

	12 Messages
📖	Linting Aerial with this PR took 0.45s vs 0.41s on master (9% slower)
📖	Linting Alamofire with this PR took 3.43s vs 3.47s on master (1% faster)
📖	Linting Firefox with this PR took 13.3s vs 13.46s on master (1% faster)
📖	Linting Kickstarter with this PR took 21.02s vs 21.12s on master (0% faster)
📖	Linting Moya with this PR took 1.86s vs 1.89s on master (1% faster)
📖	Linting Nimble with this PR took 1.99s vs 1.94s on master (2% slower)
📖	Linting Quick with this PR took 0.58s vs 0.57s on master (1% slower)
📖	Linting Realm with this PR took 3.64s vs 3.59s on master (1% slower)
📖	Linting SourceKitten with this PR took 1.16s vs 1.11s on master (4% slower)
📖	Linting Sourcery with this PR took 4.98s vs 5.04s on master (1% faster)
📖	Linting Swift with this PR took 14.48s vs 14.22s on master (1% slower)
📖	Linting WordPress with this PR took 15.39s vs 15.16s on master (1% slower)

Generated by 🚫 Danger

[codecov-io]

Codecov Report

Merging #2029 into master will decrease coverage by 0.01%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master    #2029      +/-   ##
==========================================
- Coverage   89.65%   89.64%   -0.02%     
==========================================
  Files         254      254              
  Lines       14863    14867       +4     
  Branches      967      968       +1     
==========================================
+ Hits        13326    13328       +2     
- Misses       1519     1521       +2     
  Partials       18       18

Impacted Files	Coverage Δ
Source/SwiftLintFramework/Rules/TypeNameRule.swift	91.04% <50%> (-2.61%)	⬇️

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