Add Query Builder for RediSearch commands

[ofekshenawa]

A query API builder pattern for RediSearch commands in go-redis, providing a more intuitive and type safe way to construct complex search queries and operations.

Features Added

• SearchBuilder : FT.SEARCH queries
• AggregateBuilder: FT.AGGREGATE queries
• ExplainBuilder: Query explanation with FT.EXPLAIN
• SearchInfoBuilder: Index information retrieval
• SpellCheckBuilder: Spell checking functionality
• TagValsBuilder: Tag value enumeration
• SynUpdateBuilder: Synonym management
• CursorBuilder: Cursor-based result pagination
• DictBuilder: Dictionary management
• AliasBuilder: Index alias operations
• DropIndexBuilder: Index deletion with options

Implementation Details

• Builder pattern with method chaining
• Lazy evaluation: commands execute only when Run() is called
• Backward compatible: existing FT.* methods unchanged

[ndyakov]

Hey @ofekshenawa, thank you for this contribution. @htemelski-redis and I will review it soon.