migrate over Event and Item models from CFA

[Dfeng6789]

migrated over the Event and Item models from CFA, created oneToOne between Events in Penn Clubs and the new FundedEvents from CFA

[codecov[bot]]

Codecov Report

Merging #484 (1d7f16d) into master (6b89945) will decrease coverage by 0.34%. The diff coverage is 59.06%.

@@            Coverage Diff             @@
##           master     #484      +/-   ##
==========================================
- Coverage   72.51%   72.17%   -0.35%     
==========================================
  Files          30       30              
  Lines        5869     6016     +147     
==========================================
+ Hits         4256     4342      +86     
- Misses       1613     1674      +61     

Flag	Coverage Δ
backend	72.17% <59.06%> (-0.35%)	:arrow_down:

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Impacted Files	Coverage Δ
backend/clubs/models.py	85.15% <59.06%> (-5.24%)	:arrow_down:

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[rohangpta]

Closing this because we've decided to not go ahead with the CFA <> Penn Clubs migration. For posterity, the current plan is to include a link to the CFA (#545) on the Penn Clubs homepage and separately write improvements/maintenance to the CFA codebase.

Thank you David for all your work on this!