[WIP] Add Remaining TCF Overlay Contents

[pattisdr]

Closes #3876
Backend for #3957

Description Of Changes

Round out the TCF Overlay. Add Features and Special Features to the overlay. Also add the new concept of "systems". You can save preferences against a "vendor" (which the system type is known) or a "system" where the vendor type is not known. If you save preferences against a vendor, that holds for all systems of that type.

Code Changes

• list your code changes here

Steps to Confirm

• list any manual steps for reviewers to confirm the changes

Pre-Merge Checklist

• All CI Pipelines Succeeded
• Documentation:
  • documentation complete, PR opened in fidesdocs
  • documentation issue created in fidesdocs
• Issue Requirements are Met
• Relevant Follow-Up Issues Created
• Update CHANGELOG.md
• For API changes, the Postman collection has been updated

[cypress]

Passing run #3695 ↗︎

0	4	0	0	0
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Details:

Merge 25efb1c into 2687e97...
Project: fides	Commit: fdb9e4015e ℹ️
Status: Passed	Duration: 00:51 💡
Started: Aug 22, 2023 6:38 PM	Ended: Aug 22, 2023 6:39 PM

_{This comment has been generated by cypress-bot as a result of this project's GitHub integration settings.}

[codecov]

Codecov Report

Patch coverage: 94.64% and project coverage change: +22.45% 🎉

Comparison is base (2687e97) 65.06% compared to head (25efb1c) 87.51%.

Additional details and impacted files

@@                 Coverage Diff                  @@
##           tcf_backend_poc    #3966       +/-   ##
====================================================
+ Coverage            65.06%   87.51%   +22.45%     
====================================================
  Files                  323      323               
  Lines                19940    19990       +50     
  Branches              2579     2593       +14     
====================================================
+ Hits                 12974    17495     +4521     
+ Misses                6508     2050     -4458     
+ Partials               458      445       -13     

Files Changed	Coverage Δ
...api/api/v1/endpoints/consent_settings_endpoints.py	100.00% <ø> (+23.80%)	⬆️
...i/api/v1/endpoints/privacy_preference_endpoints.py	99.09% <ø> (+70.13%)	⬆️
src/fides/api/models/privacy_preference.py	95.45% <82.14%> (+33.86%)	⬆️
src/fides/api/util/tcf_util.py	97.64% <98.27%> (+60.14%)	⬆️
...i/api/v1/endpoints/privacy_experience_endpoints.py	92.63% <100.00%> (+61.44%)	⬆️
src/fides/api/models/privacy_experience.py	98.53% <100.00%> (+54.90%)	⬆️
src/fides/api/models/sql_models.py	98.03% <100.00%> (ø)
src/fides/api/schemas/privacy_experience.py	100.00% <100.00%> (+5.88%)	⬆️
src/fides/api/schemas/privacy_preference.py	100.00% <100.00%> (+12.87%)	⬆️
src/fides/api/schemas/tcf.py	100.00% <100.00%> (+12.30%)	⬆️

... and 148 files with indirect coverage changes

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