Improve performance of treeToArrayBy and leavesBy

[stellarhoof]

Use pushOn instead of push to avoid creating temporary arrays when traversing the tree.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 652d71c72f38563dc80d8e5dc840ef5e531188d6

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | -------- | ----- | | futil-js | Patch |

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[github-actions[bot]]

Coverage after merging feature/improve-tree-fns-perf into master will be

83.92%

Coverage Report

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