Added new FlexForms contracts

Author: FrostyApeOne

src/GovUK.Dfe.CoreLibs.Contracts/ExternalApplications/Models/Request/CreateTenantRoleRequest.cs

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+namespace GovUK.Dfe.CoreLibs.Contracts.ExternalApplications.Models.Request;
+
+/// <summary>
+/// Creates a custom tenant role (non-system).
+/// </summary>
+public class CreateTenantRoleRequest
+{
+    public string Name { get; set; } = null!;
+}

src/GovUK.Dfe.CoreLibs.Contracts/ExternalApplications/Models/Request/RenameTenantRoleRequest.cs

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+namespace GovUK.Dfe.CoreLibs.Contracts.ExternalApplications.Models.Request;
+
+/// <summary>
+/// Renames a custom tenant role.
+/// </summary>
+public class RenameTenantRoleRequest
+{
+    public string Name { get; set; } = null!;
+}

src/GovUK.Dfe.CoreLibs.Contracts/ExternalApplications/Models/Request/SetRolePermissionsRequest.cs

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+using GovUK.Dfe.CoreLibs.Contracts.ExternalApplications.Enums;
+
+namespace GovUK.Dfe.CoreLibs.Contracts.ExternalApplications.Models.Request;
+
+/// <summary>
+/// A single permission grant to attach to a role.
+/// </summary>
+public class RolePermissionGrantDto
+{
+    public ResourceType ResourceType { get; set; }
+    public string ResourceKey { get; set; } = null!;
+    public AccessType AccessType { get; set; }
+}
+
+/// <summary>
+/// Replaces the full set of permissions on a tenant role.
+/// </summary>
+public class SetRolePermissionsRequest
+{
+    public IReadOnlyCollection<RolePermissionGrantDto> Permissions { get; set; }
+        = Array.Empty<RolePermissionGrantDto>();
+}

src/GovUK.Dfe.CoreLibs.Contracts/ExternalApplications/Models/Response/RolePermissionDto.cs

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+using GovUK.Dfe.CoreLibs.Contracts.ExternalApplications.Enums;
+
+namespace GovUK.Dfe.CoreLibs.Contracts.ExternalApplications.Models.Response;
+
+/// <summary>
+/// A permission grant attached to a role.
+/// </summary>
+public class RolePermissionDto
+{
+    public Guid RolePermissionId { get; set; }
+    public ResourceType ResourceType { get; set; }
+    public string ResourceKey { get; set; } = null!;
+    public AccessType AccessType { get; set; }
+}

src/GovUK.Dfe.CoreLibs.Contracts/ExternalApplications/Models/Response/TenantRoleDto.cs

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+namespace GovUK.Dfe.CoreLibs.Contracts.ExternalApplications.Models.Response;
+
+/// <summary>
+/// Tenant-scoped role summary.
+/// </summary>
+public class TenantRoleDto
+{
+    public Guid RoleId { get; set; }
+    public string Name { get; set; } = null!;
+    public bool IsSystem { get; set; }
+}