[Templates] Generate OData specific client from metadata

[ThuF]

Create a generic "OData Client" template and generate OData specific client form the system's metadata.

Creation of such client, for the end user should be as following:

1. Create new project
2. Right click on the project folder
3. Click on the Generate option
4. Select the "OData Client" from the options list
5. Provide the template specific metadata (e.g. metadata file or OData metadata endpoint)
6. Publish the generated content

Consumption of such client, for the end user should be as following:

1. Import (require(...)) the generated client into the custom code
2. Consume the client

Reference clients:

1. dirigiblelabs/client-sap-successfactors-platform
2. client-kubernetes

[Demonium]

Also add the functionnalty to both to generate also the frontend