SwiftLint: ignore Protocol Buffer files

[file-sync-app]

synced local file(s) with Nef10/common-swift-package.

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This PR was created automatically by the repo-file-sync-action workflow run #4781389848

[github-actions]

Coverage after merging repo-sync/common-swift-package/default into main

1.87%

Coverage Report

File	Stmts	Funcs	Lines	Uncovered Lines
Sources/Wealthsimple
Token.swift	0%	0%	0%	100–104, 111–124, 132–154, 156–167, 169–192, 194–198, 200–206, 208–210, 212–220, 222–226, 47–52, 54–66, 68–79, 81–99
TransactionError.swift	0%	0%	0%	29–46
WealthsimpleAccount.swift	0%	0%	0%	100–112, 114–137, 139–158, 80–95, 97–99
WealthsimpleAsset.swift	0%	0%	0%	52–68
WealthsimpleDownloader.swift	0%	0%	0%	104–117, 124–137, 139–151, 48–51, 55–80, 84–97
WealthsimplePosition.swift	0%	0%	0%	100–117, 119–142, 144–163, 53–57, 66–92, 94–99
WealthsimpleTransaction.swift	0%	0%	0%	117–121, 140–184, 186–211, 213–236, 238–257
Sources/Wealthsimple/Extensions
String+CamelCase.swift	100%	100%	100%