feat: add can_pay_by_paytm to event model and schema and refactor other keys

[shreyanshdwivedi]

Fixes #6340

Short description of what this resolves:

Adds can_pay_by_paytm to event model and schema

Checklist

• I have read the Contribution & Best practices Guide and my PR follows them.
• My branch is up-to-date with the Upstream development branch.
• The unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

• All the functions created/modified in this PR contain relevant docstrings.

[codecov]

Codecov Report

Merging #6349 into development will increase coverage by <.01%.
The diff coverage is 100%.

@@               Coverage Diff               @@
##           development    #6349      +/-   ##
===============================================
+ Coverage        65.38%   65.39%   +<.01%     
===============================================
  Files              287      287              
  Lines            14726    14729       +3     
===============================================
+ Hits              9629     9632       +3     
  Misses            5097     5097

Impacted Files	Coverage Δ
app/api/schema/events.py	91.85% <100%> (+0.06%)	⬆️
app/models/event.py	78.64% <100%> (+0.15%)	⬆️

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[shreyanshdwivedi]

@uds5501 @mrsaicharan1 @kushthedude please review

[iamareebjamal]

Change revises in migration

[shreyanshdwivedi]

@iamareebjamal @mrsaicharan1 @uds5501 updated the down_revision and revises
Please take a look