feat: add DynamoDB Distributed Lock Observability package

[ncipollina]

Summary

• Add new DynamoDb.DistributedLock.Observability package with OpenTelemetry integration
• Implement MeterProviderBuilder.AddDynamoDbDistributedLock() extension method for simplified metrics configuration
• Update documentation with comprehensive observability examples and usage patterns

Changes Made

• ✅ Created new observability project targeting .NET 8.0 and 9.0
• ✅ Added MeterProviderBuilder extension methods with proper XML documentation
• ✅ Updated solution file to include new project
• ✅ Enhanced README.md with observability package documentation
• ✅ Updated CLAUDE.md with new architecture components
• ✅ Bumped version to 1.2.1 in Directory.Build.props

Usage

using DynamoDb.DistributedLock.Observability;

services.AddOpenTelemetry()
    .WithMetrics(metrics => 
        metrics.AddDynamoDbDistributedLock() // <-- New extension method
    );

Test plan

• Solution builds successfully
• New package structure follows existing conventions
• Documentation is comprehensive and includes examples
• Extension method properly references MetricNames.MeterName constant

🤖 Generated with Claude Code

[Copilot]

Pull Request Overview

This PR adds comprehensive observability support for the DynamoDB Distributed Lock library through a new dedicated package and updated documentation. It enables simplified OpenTelemetry metrics integration while also updating package dependencies to their latest versions.

• Introduces a new DynamoDb.DistributedLock.Observability package with OpenTelemetry integration
• Adds MeterProviderBuilder.AddDynamoDbDistributedLock() extension method for simplified metrics configuration
• Updates package dependencies across the solution and enhances documentation with observability examples

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/DynamoDb.DistributedLock.Observability/DynamoDb.DistributedLock.Observability.csproj	New project file for the observability package targeting .NET 8.0 and 9.0
src/DynamoDb.DistributedLock.Observability/MeterProviderBuilderExtensions.cs	Extension method implementation for simplified OpenTelemetry metrics registration
DynamoDb.DistributedLock.sln	Solution file updated to include the new observability project
Directory.Build.props	Centralized NuGet packaging properties and version bump to 1.2.1
src/DynamoDb.DistributedLock/DynamoDb.DistributedLock.csproj	Package dependency updates and moved common properties to Directory.Build.props
test/DynamoDb.DistributedLock.Tests/DynamoDb.DistributedLock.Tests.csproj	Updated test dependencies to latest versions
README.md	Enhanced documentation with observability package usage examples and restructured telemetry section
CLAUDE.md	Updated architecture documentation to reflect new observability components

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