Update the Accessibility of scaling and metrics-related services in DurableTask.Netherite

[nytian]

This PR updates the accessibility of several metric-based services in DurableTask.Netherite for the updated scaling change in durable functions.

Related PR Azure/azure-functions-durable-extension#3240

Visibility improvements for scaling and metrics services:

• Changed the Settings property in NetheriteOrchestrationService from internal to public to allow external access.
• Made the GetLoadPublisher and GetNetheriteMetricsProvider methods in NetheriteOrchestrationService public, enabling external code to instantiate these services.

Class accessibility updates:

• Changed the AzureBlobLoadPublisher and AzureTableLoadPublisher classes from internal to public, allowing them to be used outside the Scaling namespace. [1] [2]

Version update:

• Bumped the patch version in src/common.props from 3.1.0 to 3.1.1.