Add new metadata interface to write directly to file

This interface will allow us to write the metadata directly to a file.
MacOs does not support metadata embeded directly into a .section of
object files and archives. This allows us to seperate this mechanism so
that we can follow rustc and write this directly to a seperate file.

This patch adds two new options to control metadata outputs

 -frust-embed-metadata this toggles to embed the metadata into .rust_export
 section of the target asm output

 -frust-metadata-output= specifies the path to directly write the metadata
 to file

We need these options as embeding the metadata does not seem to be
supported for all platforms like MacOs so writing directly to file is a
platform agnostic solution.

There is an implicit naming convetion to metadata export files. They need
to be of crate_name.rox. This patch adds some simple validation by checking
the basename of the specified path.

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