feat: add 'count' metric for pivot table #2885
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Summary
This PR adds support for the Count metric in
PivotTable, allowing users to aggregate data based on the number of occurrences in a given field.Currently,
exceljssupportssummetric , butcountis a widely used aggregation method in Excel that was missing.This enhancement aligns PivotTable functionality more closely with native Excel behavior.
Test plan
The PR includes a new unit test file, pivot-tables-with-count.spec.js, with tests for valid and invalid the count metric. All unit tests, including the new tests and all existing tests, pass when running "npm run test:unit".
Related to source code (for typings update)
👉 Feedback and discussion #2575.