bazel packages: decentralize StarlarkSemantics Prior to this change, StarlarkSemantics was a closed set of options, which meant that it had to enumerate all the optional key/value features of its client, Bazel. (This of course makes no sense for other clients such as Copybara.) This change turns it into an open and extensible set of key/value pairs. All the Bazel semantics option have been moved to packages.semantics.BuildLanguageOptions. This removes the last logical dependency of Starlark on Bazel. Also: - fix a few places where the old FlagIdentifier names were inconsistent with the actual flag name. - add a static check that boolean semantics options have a name that starts with + or - (to specify the default value). PiperOrigin-RevId: 330379130
{Fast, Correct} - Choose two
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