FEAT: Worker Service project template implementation

[CesarD]

Description

Include a Worker Service project template for implementing background services.
A new flag has been introduced for enabling generating the Worker Service which will be disabled by default: -w / --workerService. Only if present the Worker Service project will be rendered in the solution.

Related Issue

Closes #21

How Has This Been Tested?

Multiple projects have been generated with different combinations: with MT implementation and w/o WorkerService and viceversa, and with both flags present and also without them both.
Existing tests have been updated to conditionally include extra tests during rendering depending on the flags that have been enabled.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added/updated tests to cover my changes.
• All new and existing tests passed.