Add support for CAS/CAD commands

[a-TODO-rov]

resolves #3498

[Copilot]

Pull Request Overview

This PR adds support for two new Redis commands (DIGEST and DELEX) and introduces conditional value operations through a new ValueCondition abstraction. The changes enable value-based and digest-based conditional operations for SET, SETGET, and DELEX commands.

• Introduces ValueCondition<V> class supporting value equality/inequality and digest-based comparisons
• Adds digestKey() command to compute XXH3 64-bit digests of string values
• Adds delex() command for conditional key deletion with value/digest guards
• Extends SET and SETGET commands to support conditional operations via ValueCondition

Reviewed Changes

Copilot reviewed 28 out of 28 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
ValueCondition.java	New class providing abstraction for conditional value comparisons with factory methods for equality, inequality, and digest-based conditions
CommandType.java	Adds DIGEST and DELEX command types to the protocol enum
CommandKeyword.java	Adds IFEQ, IFNE, IFDEQ, IFDNE keywords for conditional operations
ReadOnlyCommands.java	Registers DIGEST as a read-only command
RedisCommandBuilder.java	Implements command builders for digestKey, delex, and conditional set/setGet variants
RedisStringCommands.java (template)	Adds API signatures for digestKey and conditional set/setGet operations
RedisKeyCommands.java (template)	Adds API signature for delex operation
Abstract/Reactive/Async implementations	Implements command dispatch for all API variants (sync, async, reactive, coroutines)
Cluster node selection interfaces	Adds cluster support for new commands
StringCommandIntegrationTests.java	Adds comprehensive tests for digestKey and conditional SET/SETGET operations
KeyCommandIntegrationTests.java	Adds tests for delex with various conditions
KeyClusterCommandIntegrationTests.java	Adds cluster-specific tests for delex
MasterReplicaIntegrationTests.java	Adds test verifying DIGEST can be read from replicas
ClusterReadOnlyCommandsUnitTests.java	Updates expected read-only command count from 100 to 101

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