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Introduce a marker protocol SendableMetatype that is used to indicate when the metatype of a type will conform to Sendable. Specifically, `T: SendableMetatype` implies `T.Type: Sendable`. When strict metatype sendability is enabled, metatypes are only sendable when `T: SendableMetatype`. All nominal types implicitly conform to `SendableMetatype`, as do the various builtin types, function types, etc. The `Sendable` marker protocol now inherits from `SendableMetatype`, so that `T: Sendable` implies `T.Type: Sendable`. Thank you Slava for the excellent idea!