Generalize categoryFootnotes to work on any sequence #57

Job	Run time
Run tests using swift-syntax-dev-utils (Linux)	24m 38s
Validate generated code	3m 0s
Run tests using swift-syntax-dev-utils (Windows)	41m 0s
Test / Linux (5.8 - jammy)	3m 35s
Test / Windows (5.9 - windows-2022)	15m 15s
Test / Linux (5.9 - jammy)	3m 53s
Test / Windows (6.0 - windows-2022)	19m 11s
Test / Linux (5.10 - jammy)	3m 48s
Soundness / API breakage check	3m 6s
Soundness / Documentation check	4m 43s
Soundness / Unacceptable language check	4s
Soundness / License headers check	10s
Soundness / Broken symlinks check	3s
Soundness / Format check	45s
Soundness / Shell check	43s
Soundness / YAML lint check	3s
Soundness / Python lint check	5s
Test / Windows (nightly - windows-2019)	17m 6s
Test / Linux (6.0 - jammy)	4m 1s
Test / Linux (nightly-main - jammy)	5m 20s
Test / Windows (nightly-6.1 - windows-2019)	16m 13s
Test / Linux (nightly-6.1 - jammy)	4m 30s
	2h 51m 12s

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