File_Adapter: Create partial class placed in File_Adapter moved to File_Engine

[alelom]

Issues addressed by this PR

Closes #134

Test files

https://burohappold.sharepoint.com/:w:/s/BHoM/EVWMrt6uTxpGubryxTlpmIABtA3ssfTVIhXkwViOIJZpxQ?e=btbI1e

Changelog

Additional comments

[FraserGreenroyd]

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[FraserGreenroyd]

This has been reviewed in collaboration with @alelom for merge to beta.

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