Ignore function, initializer and subscript declarations alike

[SimplyDanny]

Fixes #6241.

[SwiftLintBot]

	18 Messages
📖	Building this branch resulted in a binary size of 26895.4 KiB vs 26894.95 KiB when built on main (0% larger).
📖	Linting Aerial with this PR took 0.82 s vs 0.82 s on main (0% slower).
📖	Linting Alamofire with this PR took 1.02 s vs 1.01 s on main (0% slower).
📖	Linting Brave with this PR took 6.94 s vs 6.96 s on main (0% faster).
📖	Linting DuckDuckGo with this PR took 20.69 s vs 20.75 s on main (0% faster).
📖	Linting Firefox with this PR took 10.51 s vs 10.5 s on main (0% slower).
📖	Linting Kickstarter with this PR took 7.73 s vs 7.74 s on main (0% faster).
📖	Linting Moya with this PR took 0.45 s vs 0.44 s on main (2% slower).
📖	Linting NetNewsWire with this PR took 2.38 s vs 2.37 s on main (0% slower).
📖	Linting Nimble with this PR took 0.64 s vs 0.63 s on main (1% slower).
📖	Linting PocketCasts with this PR took 7.2 s vs 7.25 s on main (0% faster).
📖	Linting Quick with this PR took 0.41 s vs 0.4 s on main (2% slower).
📖	Linting Realm with this PR took 3.47 s vs 3.39 s on main (2% slower).
📖	Linting Sourcery with this PR took 1.84 s vs 1.83 s on main (0% slower).
📖	Linting Swift with this PR took 4.31 s vs 4.3 s on main (0% slower).
📖	Linting VLC with this PR took 1.3 s vs 1.13 s on main (15% slower).
📖	Linting Wire with this PR took 17.15 s vs 17.11 s on main (0% slower).
📖	Linting WordPress with this PR took 11.23 s vs 11.24 s on main (0% faster).

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