Part: Add PartIdentifier (mfr, p/n, datasheet)

[JasperZP]

Part: Add PartIdentifier (mfr, p/n, datasheet)

Description

Adds an optional PartIdentifier to a Part, which describes the partnumber, manufacturer, and datasheet.
This could be used for BOM exports.

Fixes #165

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[IoannisP-ITENG]

Nice idea to be able to pass through info from the pickeroption to the module descriptive_properties!
There is already (nearly) a way to do that with lower footprint.
You can use the info dict in pickeroption and pass that instead of the part because it contains the part anyway. This is useful for future additions too to avoid breaking the supplier API. The supplier can that just transparently decide to ad the properties to the module.
See the comments for more detail.