Cleanup of some obsolete configuration code

[MichaConrad]

• Cleanup of some obsolete configuration code, fixes 386
• Adding User as a config option for a Redis connection, that is supported in Redis since version 7.0

[Copilot]

Pull Request Overview

This pull request removes obsolete logger factory configuration code and adds support for Redis User authentication for Redis 6+ ACL features.

• Removed deprecated logger factory configuration schemas and related code
• Added User property to Redis configuration for ACL authentication support
• Improved error handling in Redis connection management with try-catch around connection disposal

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tools/cacheManager.json	Removed obsolete logger factory schema definitions and fixed serializer description
src/CacheManager.StackExchange.Redis/RedisConnectionManager.cs	Added try-catch around connection disposal for better error handling
src/CacheManager.StackExchange.Redis/RedisConfigurationBuilder.cs	Added WithUser method to support Redis ACL authentication
src/CacheManager.StackExchange.Redis/RedisConfiguration.cs	Added User property and parameter to constructor for Redis ACL support
src/CacheManager.Microsoft.Extensions.Configuration/MicrosoftConfigurationExtensions.cs	Replaced logger factory type with NotSupportedException and helpful migration message
src/CacheManager.Core/CacheManager.Core.csproj	Updated to use latest C# language version
samples/CacheManager.Examples/cache.json	Added new sample configuration file
samples/CacheManager.Examples/Program.cs	Enhanced examples with additional cache manager demonstrations
samples/CacheManager.Examples/CacheManager.Examples.csproj	Added cache.json as content file to be copied to output
Documentation/apispec/CacheManager_Core_MicrosoftLoggingBuilderExtensions.md	Removed obsolete documentation file
CacheManager.sln	Removed reference to deleted documentation file

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