Cascader: Don't lose input value when typing

[JoaoSilvaGrafana]

What is this feature?

Currently when you type on the Cascader input after something has been selected, it deletes your selection. For instance if you use "suffix:unit1" and want to change it to "suffix:unit2" you have to retype it all instead of it allowing you to make a simple change from "1" to "2".

Comment explaining what is happening on the original issue:

What happens is that when you open the Cascader, it renders the rc-cascader component, but as you start typing something it switches it to a regular Select and just loses what was on the input.

I've tried to fix this quickly by having the Select input being controlled, but that makes some parts of this interaction not ideal, for instance selecting the whole input and then typing doesn't replace the whole content, just adds what you typed to the end, so I'd like to get some input on if this is a good solution or not before moving ahead with the fix

Why do we need this feature?

To make it simpler to type a different value on the Cascader.

Who is this feature for?

Anyone who use cascader.

Which issue(s) does this PR fix?:

Fixes #82896

Special notes for your reviewer:
I will like for someone to have a double check at this to see if this makes sense at all or if introducing this causes more issues than it solves things.

Please check that:

• It works as expected from a user's perspective.
• If this is a pre-GA feature, it is behind a feature toggle.
• The docs are updated, and if this is a notable improvement, it's added to our What's New doc.

[JoaoSilvaGrafana]

/deploy-to-hg

[JoaoSilvaGrafana]

/deploy-to-hg

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[Clarity-89]

The fix makes sense to me, great work 🚀