New: Made Handle Controller publicly accessible

...ne.ApiClient.Core.Test/Coscine.ApiClient.Core.Test.csproj

...oscine.ApiClient.Core.Test/Model/ResourceAdminDtoTests.cs

src/Coscine.ApiClient.Core.Test/Model/ResourceDtoTests.cs

src/Coscine.ApiClient.Core/Api/ApplicationProfileApi.cs

src/Coscine.ApiClient.Core/Api/BlobApi.cs

src/Coscine.ApiClient.Core/Api/DisciplineApi.cs

src/Coscine.ApiClient.Core/Api/HandleApi.cs

src/Coscine.ApiClient.Core/Api/LanguageApi.cs

src/Coscine.ApiClient.Core/Api/LicenseApi.cs

src/Coscine.ApiClient.Core/Api/MaintenanceApi.cs

src/Coscine.ApiClient.Core/Api/OrganizationApi.cs

src/Coscine.ApiClient.Core/Api/PidApi.cs

src/Coscine.ApiClient.Core/Api/ProjectApi.cs

src/Coscine.ApiClient.Core/Api/ProjectInvitationApi.cs

src/Coscine.ApiClient.Core/Api/ProjectMemberApi.cs

...oscine.ApiClient.Core/Api/ProjectPublicationRequestApi.cs

src/Coscine.ApiClient.Core/Api/ProjectQuotaApi.cs

src/Coscine.ApiClient.Core/Api/ProjectResourceApi.cs

src/Coscine.ApiClient.Core/Api/ProjectResourceQuotaApi.cs

src/Coscine.ApiClient.Core/Api/ProjectResourceTypeApi.cs