Make composer duck aware of the conversation it is in

ts/state/selectors/composer.ts

@@ -0,0 +1,24 @@
+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { createSelector } from 'reselect';
+
+import type { StateType } from '../reducer';
+import type { ComposerStateType, QuotedMessageType } from '../ducks/composer';
+import { getComposerStateForConversation } from '../ducks/composer';
+
+export const getComposerState = (state: StateType): ComposerStateType =>
+  state.composer;
+
+export const getComposerStateForConversationIdSelector = createSelector(
+  getComposerState,
+  composer => (conversationId: string) =>
+    getComposerStateForConversation(composer, conversationId)
+);
+
+export const getQuotedMessageSelector = createSelector(
+  getComposerStateForConversationIdSelector,
+  composerStateForConversationIdSelector =>
+    (conversationId: string): QuotedMessageType | undefined =>
+      composerStateForConversationIdSelector(conversationId).quotedMessage
+);