feat: team invitation mutations

packages/hoppscotch-app/helpers/backend/gql/mutations/AcceptTeamInvitation.graphql

@@ -0,0 +1,12 @@
+mutation AcceptTeamInvitation($inviteID: ID!) {
+  acceptTeamInvitation(inviteID: $inviteID) {
+    membershipID
+    role
+    user {
+      uid
+      displayName
+      photoURL
+      email
+    }
+  }
+}

packages/hoppscotch-app/helpers/backend/gql/mutations/CreateTeamInvitation.graphql

@@ -0,0 +1,9 @@
+mutation CreateTeamInvitation($inviteeEmail: String!, $inviteeRole: TeamMemberRole!, $teamID: ID!) {
+  createTeamInvitation(inviteeRole: $inviteeRole, inviteeEmail: $inviteeEmail, teamID: $teamID) {
+    id
+    teamID
+    creatorUid
+    inviteeEmail
+    inviteeRole
+  }
+}

packages/hoppscotch-app/helpers/backend/gql/mutations/RevokeTeamInvitation.graphql

@@ -0,0 +1,3 @@
+mutation RevokeTeamInvitation($inviteID: ID!) {
+  revokeTeamInvitation(inviteID: $inviteID)
+}