fix(search): adjust field types for ft.search

[nkaradzhov]

In ft.search SORTBY, SUMMARIZE and HIGHLIGHT all take string arguments and do not need @ or $ as a prefix. In fact, if you put @ or $ there, redis returns error like this:

[SimpleError: Property @age not loaded nor in schema]

fixes #3017

[Copilot]

Pull Request Overview

This PR updates the SEARCH command interface to use plain string (or other RedisArgument) values instead of schema-bound RediSearchProperty for SORTBY, SUMMARIZE, and HIGHLIGHT options. It removes the now-unused RediSearchProperty import and adjusts the types accordingly.

• Swapped RediSearchProperty with RedisArgument for SUMMARIZE.FIELDS, HIGHLIGHT.FIELDS, and SORTBY.BY
• Removed the RediSearchProperty import from the module

Comments suppressed due to low confidence (3)

packages/search/lib/commands/SEARCH.ts:35

• Add or update tests to cover the new string-only FIELDS option in SUMMARIZE to ensure it serializes correctly in the command builder.

    FIELDS?: RedisArgument | Array<RedisArgument>;

packages/search/lib/commands/SEARCH.ts:41

• Add or update tests to cover the new string-only FIELDS option in HIGHLIGHT to ensure it serializes correctly in the command builder.

    FIELDS?: RedisArgument | Array<RedisArgument>;

packages/search/lib/commands/SEARCH.ts:54

• Add or update tests to cover the new string-only BY option in SORTBY to ensure it serializes correctly in the command builder.

    BY: RedisArgument;

[bobymicroby]

LGTM