Add API blueprints for user favourite events

[prabhupant]

Fixes #5277

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.

Short description of what this resolves:

adds api blueprints for user favourite events

Changes proposed in this pull request:

• adds api blueprints for user favourite events

[houndci-bot]

expected 2 blank lines, found 1

[codecov]

Codecov Report

Merging #5506 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #5506   +/-   ##
============================================
  Coverage        63.03%   63.03%           
============================================
  Files              264      264           
  Lines            12702    12702           
============================================
  Hits              8007     8007           
  Misses            4695     4695

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[prabhupant]

@iamareebjamal @srv-twry please review :)

[iamareebjamal]

Fix hound issues

[prabhupant]

@iamareebjamal done...please review again