[SwiftParser] Improve attribute parsing and recovering #302

Job	Run time
Run tests using swift-syntax-dev-utils (Linux)	2m 39s
Run tests using swift-syntax-dev-utils (Windows)	2m 46s
Validate generated code	2m 41s
Test / Windows (6.1 - windows-2022)	2m 47s
Test / Windows (6.0 - windows-2022)	2m 47s
Test / Windows (5.9 - windows-2022)	2m 44s
Test / macOS (Xcode ${{ matrix.xcode_version }} - ${{ matrix.os_version }} - ${{ matrix.arch }})	0s
Test / Static Linux Swift SDK Build (${{ matrix.swift_version }} - ${{ matrix.os_version }})	0s
Test / Linux (6.0 - jammy)	2m 40s
Test / Windows (nightly-6.2 - windows-2022)	2m 44s
Test / Swift SDK for Wasm Build (${{ matrix.swift_version }} - ${{ matrix.os_version }})	0s
Test / Embedded Swift SDK for Wasm Build (${{ matrix.swift_version }} - ${{ matrix.os_version }})	0s
Test / Linux (nightly-main - jammy)	2m 40s
Test / Linux (nightly-6.2 - jammy)	2m 41s
Test / Linux (5.10 - jammy)	2m 42s
Test / Windows (nightly - windows-2022)	2m 48s
Test / Linux (6.1 - jammy)	2m 42s
Test / Linux (5.9 - jammy)	2m 39s
Soundness / API breakage check	0s
Soundness / Documentation check	2m 43s
Soundness / Unacceptable language check	4s
Soundness / License headers check	11s
Soundness / Format check	42s
Soundness / Broken symlinks check	4s
Soundness / Shell check	31s
Soundness / Python lint check	5s
Soundness / YAML lint check	5s
	42m 25s

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