refactor: split resolver into multiple files based on domain

internal/graph/schema/team/member.gql

@@ -0,0 +1,43 @@
+extend type Mutation {
+  createTeamMember(input: CreateTeamMember!):
+    CreateTeamMemberPayload! @hasRole(roles: [ADMIN], level: TEAM, type: TEAM)
+  updateTeamMemberRole(input: UpdateTeamMemberRole!):
+    UpdateTeamMemberRolePayload! @hasRole(roles: [ADMIN], level: TEAM, type: TEAM)
+  deleteTeamMember(input: DeleteTeamMember!):
+    DeleteTeamMemberPayload! @hasRole(roles: [ADMIN], level: TEAM, type: TEAM)
+
+}
+
+input DeleteTeamMember {
+  teamID: UUID!
+  userID: UUID!
+  newOwnerID: UUID
+}
+
+type DeleteTeamMemberPayload {
+  teamID: UUID!
+  userID: UUID!
+  affectedProjects: [Project!]!
+}
+
+input CreateTeamMember {
+  userID: UUID!
+  teamID: UUID!
+}
+
+type CreateTeamMemberPayload {
+  team: Team!
+  teamMember: Member!
+}
+
+input UpdateTeamMemberRole {
+  teamID: UUID!
+  userID: UUID!
+  roleCode: RoleCode!
+}
+
+type UpdateTeamMemberRolePayload {
+  ok: Boolean!
+  teamID: UUID!
+  member: Member!
+}