feat: add sub for redis

[wwwfeng]

Currently, there are pub commands, but no sub commands, which feels odd. This PR adds the missing sub functionality.

[Copilot]

Pull Request Overview

This PR adds subscription functionality for Redis by introducing new cluster and client managers for pub/sub as well as corresponding API methods and tests.

• Introduces getPubSubCluster and getPubSubClient functions for handling Redis subscriptions.
• Adds new subscription methods (Subscribe, SubscribeCtx, PSubscribe, PSubscribeCtx) in redis.go.
• Provides tests to validate the new pub/sub behavior.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
core/stores/redis/redispubsubclustermanager.go	Adds cluster client creation for pub/sub subscriptions
core/stores/redis/redispubsubclientmanager.go	Adds standard client creation for pub/sub subscriptions
core/stores/redis/redis_test.go	Implements tests for different pub/sub subscription scenarios
core/stores/redis/redis.go	Adds new subscription API methods and introduces getPubSubRedis helper

[codecov]

Codecov Report

Attention: Patch coverage is 35.92233% with 66 lines in your changes missing coverage. Please review.

Project coverage is 94.23%. Comparing base (8690859) to head (f328d98).
Report is 289 commits behind head on master.

Files with missing lines	Patch %	Lines
core/stores/redis/redispubsubclientmanager.go	0.00%	36 Missing ⚠️
core/stores/redis/redis.go	40.62%	16 Missing and 3 partials ⚠️
core/stores/redis/redispubsubclustermanager.go	68.57%	8 Missing and 3 partials ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
core/stores/redis/redispubsubclustermanager.go	68.57% <68.57%> (ø)
core/stores/redis/redis.go	98.22% <40.62%> (-1.55%)	⬇️
core/stores/redis/redispubsubclientmanager.go	0.00% <0.00%> (ø)

... and 15 files with indirect coverage changes

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