Reduce build times for dependents by moving build.rs to a snapshot test

[epage]

Generating static code in a build.rs works well when there is a lot of churn as developers can make a change and its automatically applied. This comes at a cost to dependents who have to build and run the build script, multiplying out the build time costs across the community.

I assume the schema for sarif does not see a lot of churn and it seems like it could offer good build benefits for this repo and for dependents to move code generation to a test.

e.g. https://github.com/crate-ci/typos/blob/3683264986a72f63f13e9e8fc132a13af2a322b8/crates/typos-dict/tests/codegen.rs#L1-L12