"options" property added in DockWidgetInstantiator.h/cpp

[evg1234]

This property turned out to be useful for me in the qtquick dock widget

[iamsergio]

@winterz cla bot not working ?

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
0 out of 2 committers have signed the CLA.

❌ pre-commit-ci[bot]
❌ evg1234
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