add `#[non_exhaustive]` to `SpirvBuilder` and all dependent structs #410

Job	Run time
Lint	5m 53s
Test (ubuntu-24.04, x86_64-unknown-linux-gnu)	16m 10s
cargo-deny	1m 3s
Test (macOS-latest, x86_64-apple-darwin)	10m 56s
Test (windows-2022, x86_64-pc-windows-msvc)	27m 16s
Test (ubuntu-24.04, aarch64-linux-android, x86_64-unknown-linux-gnu)	7m 43s
test_success	3s
	1h 9m 4s

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