Add ControlOrMeta key

[ankur22]

What

We want to add the same ControlOrMeta helper key to easily allow for its use when running the test on different platforms.

Why

It will make the test script easier to write and multi-platform when working with the meta key when clicking on a link to open it in a new tab.

Tasks

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1. Add ControlOrMeta helper key #1457
   +0
2. Add a new example on waitForEvent k6-docs#1760
   +0
3. Add to release notes: https://github.com/grafana/k6/commit/452f369e107f6fe95a366e3cd349fe8d2e82f933