Support tuple returns from dictionaries

Today we skip those, thanks to https://github.com/swiftlang/swift-java/pull/750, as they may cause errors like:

ObertonWalletCore/destination/JExtractSwiftPlugin/Sources/BindingStore+SwiftJava.swift:24:41: error: type 'BindingStore.RawResponse' (aka '(requestId: UInt32, stringResponse: String, responseType: TSDKBindingResponseType, finished: Bool)') cannot conform to 'JavaBoxable' [#ProtocolTypeNonConformance]
22 | @_cdecl("Java_com_custwallet_core_BindingStore__00024getCompleteResponses__")
23 | public func Java_com_custwallet_core_BindingStore__00024getCompleteResponses__(environment: UnsafeMutablePointer<JNIEnv?>!, thisClass: jclass) -> jlong {
24 |   return BindingStore.completeResponses.dictionaryGetJNIValue(in: environment)
   |                                         |- error: type 'BindingStore.RawResponse' (aka '(requestId: UInt32, stringResponse: String, responseType: TSDKBindingResponseType, finished: Bool)') cannot conform to 'JavaBoxable' [#ProtocolTypeNonConformance]
   |                                         `- note: only concrete types such as structs, enums and classes can conform to protocols
25 | }

Because the tuple cannot conform to JavaBoxable. We could find some way to support these?

Start by reviewing the dictionaryGetJNIValue call in ObertonWalletCore/destination/JExtractSwiftPlugin/Sources/BindingStore+SwiftJava.swift and the context from pull request #750. Determine how tuple returns should be represented for JavaBoxable, then verify that dictionary returns containing tuples no longer produce the reported protocol-conformance error.