feat!: signature file grammar #313

Job	Run time
Fuzz fsharp	53s
Fuzz fsharp signature	1m 18s
Parse examples (ubuntu-latest)	6m 43s
Parse examples (macos-14)	5m 11s
Test Go binding (ubuntu-latest)	8s
Test Node binding (ubuntu-latest)	14s
Test Go binding (windows-latest)	51s
Test parser (ubuntu-latest)	11s
Test Go binding (macos-latest)	12s
Test Python binding (ubuntu-latest)	14s
Test Node binding (macos-latest)	48s
Test parser (windows-latest)	41s
Test Python binding (windows-latest)	58s
Test parser (macos-14)	24s
Test Python binding (macos-latest)	19s
Test Rust binding (ubuntu-latest)	13s
Test Rust binding (windows-latest)	1m 37s
Test Rust binding (macos-latest)	22s
	21m 17s

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