Move builtins to snake_case

[smores56]

Now that we have automatic camelCase -> snake_case conversion and parentheses-based function call support, we can move our builtins to snake_case and parens. This started as an attempt to auto-convert camelCase idents to snake_case ones by translating all idents in our canonicalization phase to snake_case, but it led to some tricky issues surrounding FFI. This has become a monolithic change of all roc idents I could find in code and tests from camelCase to snake_case.

Once all of the tests are passing with this PR, we should prepare PRs for basic-cli and basic-webserver and then just shoot all three of these snake_case changes out of a cannon simultaneously.

These are WIP:
basic-cli PR
basic-webserver PR

[smores56]

When I remove the auto-case conversion in the string interner, there is still infinite hanging in the build script, so there must be something else that I forgot to update in the compiler

[smores56]

We depend on basic-ssg for our website, and that is using old builtins. I'm working on updating it, this is blocked on getting a basic-ssg pre-release with snake_case builtins.