bazel syntax: eliminate two subclasses of BuiltinFunction This change replaces two test-only subclasses of BuiltinFunction with StarlarkCallables. (The remaining two subclasses, rule and repository_rule, will be dealt with in a follow-up.) Also, change type of rule's and repository_rule's "implementation" parameter to StarlarkFunction, and eliminate casts that already made this assumption. Also, give StarlarkCallable.getLocation a default value of BUILTIN. PiperOrigin-RevId: 285022081
{Fast, Correct} - Choose two
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