add type definition for DropSummary

[austinkline]

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[codecov]

Codecov Report

Attention: Patch coverage is 88.67925% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 94.88%. Comparing base (8a84145) to head (f2bffc5).

❗ Current head f2bffc5 differs from pull request most recent head d871d61. Consider uploading reports for the commit d871d61 to get more accurate results

Files	Patch %	Lines
contracts/DropTypes.cdc	87.50%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #8      +/-   ##
==========================================
- Coverage   96.95%   94.88%   -2.07%     
==========================================
  Files           5        6       +1     
  Lines         164      215      +51     
==========================================
+ Hits          159      204      +45     
- Misses          5       11       +6     

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