allow selection escape with escape button

[warm-coolguy]

Summary

When navigating the result selection via keyboard, pressing Escape will now let users close the result list. The focus will then be in the same place as if the result list was closed due to an actual selection.

I'm rather unhappy with the solution as, in Fullscreen mode, the plugin will take precedence and use the escape signal first, stopping its progression. Also, I couldn't make the clear button available, since that is a bug fixed in vuetify@3, where migration is not trivial, and it seems they only adressed that in the next major version. If you care:

• [Bug Report][3.3.21] Accessibility: v-select and v-autocomplete Clearable icon not keyboard accessible vuetifyjs/vuetify#18482
• fix(VSelects): focus / activation of chips and clearable w/ kb vuetifyjs/vuetify#18838

Hence, this minimal and IMO okayish solution. At least everything can be done via keyboard, even if not in an ideal fashion.

Instructions for local reproduction and review

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Relevant tickets, issues, et cetera

Resolves #110

[dopenguin]

🚀 @warm-coolguy