[Network] Allow the user to filter the organisations

On the Network module, this PR adds the possibility to filter the organisations by type, thematic and country.

Acceptance criteria

There is a way to filter organizations by:
- Organization type
- Thematic
- 🧑‍💻 Multiple Strapi fields to be combined together:
  - main_organization_theme
  - secondary_organization_theme
- Country
The filters affect both the list and the map
For each filter dropdown, there is a way to:
- Select all the options (“Select all”)
- Deselect all the options (“Clear”)
- Search options by keywords
- Close the dropdown by clicking the arrow
- Close the dropdown by clicking elsewhere on the page
- The number of selected options is shown when the dropdown is collapsed
- The primary colour is blue
By default, none of the filters (and filter options) are selected
There is a way to reset organisation filters i.e. all the filters (and filter options) are deselected
There is a way to indicate that organisation filters are applied when the filter sidebar is collapsed

ORC-242 Organisation filters
- ORC-278 FE - Implement the filter dropdown
- ORC-240 FE - Implement the organisation filters