Add support for Redis SINTERCARD command

[Kiminni]

Summary

Implements support for Redis 7.0+ SINTERCARD command in Spring Data Redis.

Fixes #2906

Changes

Core Implementation

• Add sInterCard method to RedisSetCommands interface
• Implement sInterCard in JedisSetCommands using Jedis client
• Implement sInterCard in LettuceSetCommands using Lettuce client

Cluster Support

• Add cluster-aware sInterCard in JedisClusterSetCommands
• Add cluster-aware sInterCard in LettuceClusterSetCommands
• Same-slot optimization with native cluster commands
• Cross-slot fallback using intersection calculation

Connection Wrappers

• Add sInterCard delegation in DefaultedRedisConnection
• Add sInterCard support in StringRedisConnection
• Implement serialization handling in DefaultStringRedisConnection

High-Level API

• Add user-friendly intersectSize methods to SetOperations
• Implement intersectSize in DefaultSetOperations
• Support multiple method overloads for different key patterns

Testing

• Comprehensive integration tests with @EnabledOnCommand("SINTERCARD")

• Test coverage for all connection types (Jedis, Lettuce, Cluster)

• Various intersection scenarios (empty, partial, full)

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[onobc]

Thanks for the excellent contribution @Kiminni.

I believe there are still a few places to add the new API to:

• RedisSet / DefaultRedisSet / DefaultRedisZSet
• BoundSetOperations
• the Reactive counterparts

[Kiminni]

Hello, @onobc.

I’ve applied the requested changes and addressed the review feedback.
Please review again and let me know if there are any remaining issues or further adjustments needed.

Thank you!

[onobc]

Thank you for the contribution @Kiminni - well done! I am closing in favor of b09f752