Add compileError when a function is used where it is not supported

[sea-grass]

This PR adds a @compileError statement with a helpful error message if the user tries to reference a function that is unavailable in their chosen lang.

Most of these functions previously only had a doc comment clarifying e.g. that they're only supported in Luau, so in most cases this adds additional safety. However, there was one function, raiseInterruptErrorStr, which became a no-op if the lang weren't Lua, instead of providing an error. While I took the approach of raising a compile error if the function were used but not supported, there is precedent of turning an unsupported function into a no-op. While I believe the more appropriate path would be to raise a compile error, I'm interested in hearing what the preferred outcome is for these cases.