Intern SkylarkProviderIdentifier across packages and RuleClasses. A RuleClass advertises its providers by making available Sets of SkylarkProviderIdentifier. For native providers, sharing a SkylarkProviderIdentifier instance is accomplished using Java singletons and is already done consistently. Starlark providers and their SkylarkProviderIdentifiers are created during package loading, and two packages can load a SkylarkProvider from a shared .bzl file. When imports are inlined in PackageFunction, package+starlark import loading for two packages can happen on two threads with no explicit communication between them. Thus, the SkylarkProviderIdentifier factory methods are the last and only synchronization point to ensure different packages share a SkylarkProviderIdentifier instance. RELNOTES: None. PiperOrigin-RevId: 263140256
{Fast, Correct} - Choose two
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