Introduce DefaultHttpEndpointBasePathProvider and TenantPrefixHttpEndpointBasePathProvider to manage HTTP endpoint base paths. Update ITenantAccessor property from CurrentTenant to Tenant for consistency across the codebase.
* Refactor: Update namespaces and add TenantExtensions
Updated namespaces throughout the project to improve clarity and consistency by moving from 'Common' to appropriate modules. Added TenantExtensions class to simplify fetching connection strings for tenants.
* Implement multitenant DB connection strings
Redesign tenant-specific classes to support multitenancy more effectively. Introduce `MultitenantBackgroundService` and `MultitenantHostedService` for handling tasks per tenant.
* Refactor constructors and remove redundant code
Simplified the constructor parameters for `MultitenantBackgroundService` and `List` class. Removed the unused parameter in `MultitenantBackgroundService` and redundant folder inclusion in the project file. Updated the method calls to use direct parameters in `List` class.
* Remove unused import in ActivityDescriptors Endpoint
The Elsa.Common.Multitenancy import was removed as it is unused in the List/Endpoint.cs file. Removing unused imports helps to improve code readability and maintainability. This change does not affect functionality.
