fix: calling open() method multiple times should keep drop (re)open

[ghiscoding]

• in the original ms-select, the body click was being triggered prior to the open() method but that is inversed in our new lib with vanilla JS, so in order to have the same lifecycle as the original, we can simply add a single CPU cycle delay. This delay arg could also be used by the users for other reasons
• the open() method which this PR fixes is demoed in methods 05 demo

[github-actions]

🎭 Playwright Summary - Success 🎉

Playwright Report

multiple-select-root@0.0.0 test:e2e:ci /home/runner/work/multiple-select-vanilla/multiple-select-vanilla
playwright test --config playwright/playwright.config.ts

Running 102 tests using 1 worker
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102 passed (2.6m)