Add search/autocomplete support to attribute and option dropdowns

[carloea2]

Feature Summary

Dropdowns used throughout the Texera UI, especially attribute selectors in operator properties, currently require users to manually scroll through all available options.

For example, in the Type Casting operator, the Attribute dropdown displays all input attributes as a scrollable list but does not provide any search or autocomplete functionality.

This becomes inconvenient when working with datasets that contain a large number of attributes, since users need to manually scan and scroll through the list to find the desired attribute.

The same usability issue can occur in other dropdowns with many options across the application.

Proposed Solution or Design

Add search/autocomplete functionality to dropdowns that may contain a large number of options.

For attribute selectors, users should be able to:

• Click the dropdown and start typing an attribute name.
• Filter the available attributes based on the entered text.
• Select the matching attribute using either the mouse or keyboard.
• Continue using the dropdown normally without typing if preferred.

Affected Area

Frontend / Workflow Editor / Operator Property Panel / Dropdown components

Example: the Attribute selector in the Type Casting operator shown in the attached screenshot.