feat: Ion-select - add <optgroup> (group wise) list and be able to search in the modal interface

[prakash-patel-2801]

Prerequisites

• [x] I have read the Contributing Guidelines.
• [x] I agree to follow the Code of Conduct.
• [x] I have searched for existing issues that already include this feature request, without success.

Describe the Feature Request

I need to add and also the option to do search using with a modal interface. Below is the example link.

https://www.w3schools.com/tags/tag_optgroup.asp

https://codepen.io/rjleurck/pen/PxZKYr

https://codepen.io/cbrewster/pen/PKKQyJ

Describe the Use Case

I need to add and also the option to do search using with a modal interface. Below is the example link.

https://www.w3schools.com/tags/tag_optgroup.asp

https://codepen.io/rjleurck/pen/PxZKYr

https://codepen.io/cbrewster/pen/PKKQyJ

Describe Preferred Solution

No response

Describe Alternatives

No response

Related Code

No response

Additional Information

No response

[prakash-patel-2801]

More examples are below.

https://demo.mobiscroll.com/fullscreen/select/filtering-values

https://demo.mobiscroll.com/fullscreen/select/group-options