Add `just`: new constructor to `IndexSet` and `IndexMap` respectively#331

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Sajjon wants to merge 1 commit intoindexmap-rs:mainfrom Sajjon:feature/new_ctor_single_item

+35-1

Commits on Jul 3, 2024

Add a new constructor to IndexSet and IndexMap respectively: 'just' creating a collection from a single element.
Sajjon
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