feat: leave project and workspace endpoint (#2042)

* feat: leave project and workspace endpoint

* fix: argument error

* dev: update endpoint status

apiserver/plane/api/views/workspace.py

@@ -1473,3 +1473,44 @@ class WorkspaceMembersEndpoint(BaseAPIView):
                 {"error": "Something went wrong please try again later"},
                 status=status.HTTP_400_BAD_REQUEST,
             )
+
+
+class LeaveWorkspaceEndpoint(BaseAPIView):
+    permission_classes = [
+        WorkspaceEntityPermission,
+    ]
+
+    def delete(self, request, slug):
+        try:
+            workspace_member = WorkspaceMember.objects.get(
+                workspace__slug=slug, member=request.user
+            )
+
+            # Only Admin case
+            if (
+                workspace_member.role == 20
+                and WorkspaceMember.objects.filter(
+                    workspace__slug=slug, role=20
+                ).count()
+                == 1
+            ):
+                return Response(
+                    {
+                        "error": "You cannot leave the workspace since you are the only admin of the workspace you should delete the workspace"
+                    },
+                    status=status.HTTP_400_BAD_REQUEST,
+                )
+            # Delete the member from workspace
+            workspace_member.delete()
+            return Response(status=status.HTTP_204_NO_CONTENT)
+        except WorkspaceMember.DoesNotExist:
+            return Response(
+                {"error": "Workspace member does not exists"},
+                status=status.HTTP_400_BAD_REQUEST,
+            )
+        except Exception as e:
+            capture_exception(e)
+            return Response(
+                {"error": "Something went wrong please try again later"},
+                status=status.HTTP_400_BAD_REQUEST,
+            )