[SwiftScan] Add APIs to load/check libSwiftScan directly #1529
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Add APIs for SwiftDriver library users to directly load/check the libSwiftScan directly before calling into its function.
verifyOrCreateScannerInstance
to be public APIs to load or check the libSwiftScan.verifyOrCreateScannerInstance
to be more ergonomic to use. The function only returns true if the given path to libSwiftScan does not exist while most of the time caller actually errors out in those cases. Make throwing error the default behavior and caller can check for file existance before calling the function to perserve old behavior.