feat: Added string options to search and aggregate commands

[jruaux]

Summary

• Enhanced FT.SEARCH and FT.AGGREGATE commands to accept string-based options alongside existing object-based options
• Added string parameter overloads to search and aggregate methods across sync, async, and reactive APIs
• Updated command builders to support both option types for improved flexibility

Changes

• Core APIs: Added string option variants to RediSearchCommands, RediSearchAsyncCommands, and RediSearchReactiveCommands
• Implementations: Updated command implementations in RedisModulesAsyncCommandsImpl, RedisModulesReactiveCommandsImpl, and cluster variants
• Command Builder: Enhanced SearchCommandBuilder to handle string-based options
• Tests: Added test coverage for new string option functionality

Test plan

• Verify existing tests pass with new string option support
• Add tests for string-based search and aggregate operations
• Validate both object and string options work correctly
• Test across sync, async, and reactive command variants