refactor: Split redis service to new crate

[koushiro]

Which issue does this PR close?

Part of #6829
Closes #.

Rationale for this change

What changes are included in this PR?

• split redis service into a separate crate

Are there any user-facing changes?

AI Usage Statement

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[Copilot]

Pull request overview

This PR splits the Redis service implementation from the monolithic opendal-core crate into a separate opendal-service-redis crate, following the refactoring plan outlined in #6829. The goal is to modularize OpenDAL's architecture while maintaining backward compatibility through facade re-exports.

Key Changes:

• Created new opendal-service-redis crate with dedicated Cargo.toml configuration
• Migrated all Redis-specific code from core/core/src/services/redis/ to core/services/redis/src/
• Updated imports from crate:: to opendal_core:: throughout the Redis service implementation
• Updated feature flags and dependencies in root and core Cargo.toml files

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
core/Cargo.toml	Added opendal-service-redis dependency and mapped feature flags for services-redis and services-redis-native-tls
core/Cargo.lock	Updated lock file reflecting the new crate structure and dependency changes
core/src/lib.rs	Added re-export for opendal-service-redis and opendal-service-vercel-artifacts in the services module
core/core/Cargo.toml	Removed redis-specific features and dependencies from the core crate
core/core/src/services/mod.rs	Removed redis module declaration and re-export from core services
core/services/redis/Cargo.toml	New manifest for the standalone redis service crate
core/services/redis/src/lib.rs	Updated module declarations and crate-level documentation with proper registration
core/services/redis/src/backend.rs	Updated imports from crate::* to opendal_core::*
core/services/redis/src/config.rs	Updated imports and Configurator trait implementation references
core/services/redis/src/core.rs	Updated imports to use opendal_core::
core/services/redis/src/delete.rs	Updated imports and simplified Arc usage
core/services/redis/src/writer.rs	Updated imports and simplified Arc usage
core/services/redis/src/docs.md	Updated example code to use opendal_service_redis::Redis instead of opendal_core::services::Redis

Comments suppressed due to low confidence (1)

core/services/redis/src/backend.rs:23

• Missing import for Duration. The default_ttl method parameter uses Duration but it's not imported. Add use std::time::Duration; to the imports section at the top of the file.

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[Xuanwo]

Thank you!