Make `JSObject` conform to `ExpressibleByDictionaryLiteral` #1358

Job	Run time
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.0.2-release/ubuntu2204/swift-6.0...	1m 24s
Build for native target (macos-15, Xcode_16)	43s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	1m 33s
format	29s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	1m 36s
	5m 45s

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