[SwiftParser] Improve attribute parsing and recovering #310

Job	Run time
Run tests using swift-syntax-dev-utils (Linux)	24m 38s
Validate generated code	3m 1s
Test / Linux (5.10 - jammy)	4m 4s
Run tests using swift-syntax-dev-utils (Windows)	45m 46s
Test / Linux (6.0 - jammy)	4m 11s
Test / Linux (nightly-6.2 - jammy)	4m 49s
Test / Linux (5.9 - jammy)	3m 55s
Test / Linux (6.1 - jammy)	4m 7s
Test / Linux (nightly-main - jammy)	5m 5s
Test / Windows (5.9 - windows-2022)	21m 37s
Test / Static Linux Swift SDK Build (${{ matrix.swift_version }} - ${{ matrix.os_version }})	0s
Test / Windows (6.0 - windows-2022)	16m 55s
Test / Windows (6.1 - windows-2022)	16m 11s
Test / Windows (nightly - windows-2022)	16m 5s
Test / Windows (nightly-6.2 - windows-2022)	27m 16s
Test / Embedded Swift SDK for Wasm Build (${{ matrix.swift_version }} - ${{ matrix.os_version }})	0s
Test / macOS (Xcode ${{ matrix.xcode_version }} - ${{ matrix.os_version }} - ${{ matrix.arch }})	0s
Test / Swift SDK for Wasm Build (${{ matrix.swift_version }} - ${{ matrix.os_version }})	0s
Soundness / Format check	39s
Soundness / License headers check	12s
Soundness / Shell check	33s
Soundness / YAML lint check	6s
Soundness / Documentation check	5m 8s
Soundness / Broken symlinks check	5s
Soundness / Python lint check	8s
Soundness / Unacceptable language check	6s
Soundness / API breakage check	0s
	3h 24m 37s

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