Preserve 'pin' objects (DFII/cadence pin object) through GDS by using attributes of the text object

[sbuchbinder]

See:
https://community.cadence.com/cadence_technology_forums/f/custom-ic-skill/23015/pin-layers-not-coming-after-running-stream-in-layout

[sbuchbinder]

Notes:

• Have the attribute number be a tech parameter.
• build out an automated stream-in feature so that the pin attribute number can be set properly