Web Map Services list for add layer control should be configurable

[silmeUsil0001]

Describe the bug
Web Map Services list for add layer control should be configurable. When add map panel is opened, a list of preconfigured WMS is displayed. This list should be configured is Admin module and not hardcoded in viewer client

To Reproduce
Steps to reproduce the behavior:

1. Go to viewer and load application number 12
2. Click on tool panel and select "Add map" control. On the default list, some WMS services are listed

Expected behavior
This list should be configured as a parameter in applicaction panel of the admin module

Screenshots

[fjlopez]

@mvinent @silmeUsil0001 which should be the priority of this bug?

[mvinent]

Maybe P1 is enough

[daniboube]

This functionality is controlled by the SITNA "DataLoader" control. This control accepts a series of configurable options that must be served by the backend. For this issue, the option we are interested in adding is "wmsSuggestions" of type WmsGroupOption Array. This is parsed in the corresponding section of the sitna-helpers.ts file.

SITNA API Documentation about this: https://sitna.navarra.es/api/doc/SITNA.control.html#.DataLoaderOptions

[fjlopez]

Moved to backlog, as this issue should be reviewed when the support in the backend is implemented.