Introduced a remainOnSelect property

[PhonicCanine]

When added to a Menu, a new "remainOnSelect" property allows the menu to remain active even after the user selects an item.
This should be particularly useful for multi-select scenarios.

[codecov]

Codecov Report

Merging #379 (0470811) into master (91ec16c) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 0470811 differs from pull request most recent head 65ed0c4. Consider uploading reports for the commit 65ed0c4 to get more accurate results

@@           Coverage Diff           @@
##           master     #379   +/-   ##
=======================================
  Coverage   95.64%   95.64%           
=======================================
  Files          11       11           
  Lines         919      919           
  Branches      274      274           
=======================================
  Hits          879      879           
  Misses         40       40           

Impacted Files	Coverage Δ
src/Menu.tsx	98.12% <100.00%> (ø)

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