Enhance design editor generated SDC

[chungshien-chai]

Existing extractor already have information about if a clock need to be routed to fabric
Exisitng extractor already generate SDC file which contains set_clock_pin command

This PR

1. Use the "clock-to-fabric routing" information to filter pin/mode assignment from user.
2. If the clock is not needed by fabric, extractor will commet it out in design_editor version of SDC
3. Enhance the code to auto-determine "mode" based on primitive connectivity
4. In summary: now extractor will ALWAYS generate 3 information of all port
   • set_clock_pin
   • set_mode
   • set_io

Testing:

• ported code to latest NS Raptor manually (with PinC use design editor generated SDC FOEDAG#1592)
• run batch, batch_gen2 (no run on batch_gen3)

[behzadmehmood-rs]

LGTM.