Build message threads (#3593)

* Adding message thread component

* Add state and mocks

* Rename components and use local state for messages

---------

Co-authored-by: Thomas Trompette <thomast@twenty.com>

packages/twenty-front/src/modules/activities/emails/state/viewableEmailThreadState.ts

@@ -0,0 +1,8 @@
+import { atom } from 'recoil';
+
+import { MockedThread } from '@/activities/emails/mocks/mockedEmailThreads';
+
+export const viewableEmailThreadState = atom<MockedThread | null>({
+  key: 'viewableEmailThreadState',
+  default: null,
+});