Support all the JFR event attribute types

[gunnarmorling]

• boolean
• char
• byte
• short
• int
• long
• float
• double
• String
• Thread
• Class
• ClassLoader
• StackTrace
• jdk.ReservedStackActivation::method: jdk.types.Method
• jdk.GCHeapSummary::heapSpace: jdk.types.VirtualSpace
• jdk.MetaspaceSummary::metaspace: jdk.types.MetaspaceSizes
• jdk.PSHeapSummary::oldObjectSpace: jdk.types.ObjectSpace
• jdk.G1EvacuationYoungStatistics::statistics: jdk.types.G1EvacuationStatistics
• jdk.PromotionFailed::promotionFailed: jdk.types.CopyFailed
• jdk.CompilerInlining::callee: jdk.types.CalleeMethod
• jdk.OldObjectSample::object: jdk.types.OldObject
• jdk.OldObjectSample::root: jdk.types.OldObjectGcRoot
• jdk.ModuleRequire::source: jdk.types.Module
• jdk.ModuleExport::exportedPackage: jdk.types.Package