Preserve all metadata streams and their order

[Washi1337]

Problem Description

Currently, the ManagedPEImageBuilder does not preserve any non-conventional metadata streams of the original input binary, nor does it preserve the original order the streams are defined. This can be problematic for processing binaries that are obfuscated and/or depend on these unknown streams / order of streams.

Proposal

Add MetadataBuilderFlags.PreserveUnknownStreams and MetadataBuilderFlags.PreserveStreamOrder.

Alternatives

A workaround for now is to first turn a ModuleDefinition into a PEImage, and then manually add / reorder the streams in the constructed metadata directory. This, however, requires more effort from the end-user and is not always trivial to implement.

Additional Context

Obfuscators like KoiVM like to insert custom metadata streams to the beginning of the list of the metadata directory.