Allow string dates to stay strings in cache decoding

[sanders41]

Closes #2691

Code Changes

• Prefix date objects when caching
• Look for date prefix before decoding back to a date object

Steps to Confirm

• Send values to cache that are a date object
• Retrieve the values and verify they are returned as date objects
• Send date values to cache formatted as a string
• Retrieve the values and verify they are in string format

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

Description Of Changes

Write some things here about the changes and any potential caveats

[sanders41]

@galvana will you see if this fixes your issue?

[cypress]

Passing run #376 ↗︎

0	3	0	0	0
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Details:

Merge 850c742 into 72b5dfe...
Project: fides	Commit: 8576c10ca9 ℹ️
Status: Passed	Duration: 00:52 💡
Started: Feb 24, 2023 12:36 PM	Ended: Feb 24, 2023 12:37 PM

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

[codecov]

Codecov Report

Base: 86.46% // Head: 86.46% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (850c742) compared to base (72b5dfe).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2695      +/-   ##
==========================================
- Coverage   86.46%   86.46%   -0.01%     
==========================================
  Files         289      289              
  Lines       15984    15982       -2     
  Branches     2026     2027       +1     
==========================================
- Hits        13821    13819       -2     
  Misses       1779     1779              
  Partials      384      384              

Impacted Files	Coverage Δ
src/fides/api/ops/util/cache.py	93.80% <100.00%> (-0.11%)	⬇️

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[galvana]

Thanks @sanders41 that was it!

[galvana]

Looks good! Thanks for the quick turnaround on this