Added the `MemberCancelEvent` to the event store

[tpatel]

refs https://github.com/TryGhost/Team/issues/1302

• Enables querying for MemberCancelEvent

[codecov-commenter]

Codecov Report

Merging #377 (f022351) into main (7081c38) will decrease coverage by 0.06%. The diff coverage is 12.12%.

@@            Coverage Diff             @@
##             main     #377      +/-   ##
==========================================
- Coverage   29.66%   29.60%   -0.07%     
==========================================
  Files          72       72              
  Lines        8852     8885      +33     
  Branches      357      354       -3     
==========================================
+ Hits         2626     2630       +4     
- Misses       6223     6252      +29     
  Partials        3        3              

Impacted Files	Coverage Δ
packages/members-api/lib/MembersAPI.js	0.00% <0.00%> (ø)
packages/members-api/lib/repositories/event.js	41.54% <12.50%> (-1.78%)	:arrow_down:

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