feat: emoji reactions for tasks and comments (#2196)

This PR adds reactions for tasks and comments, similar to what you can do on Gitea, GitHub, Slack and plenty of other tools.

Reviewed-on: https://kolaente.dev/vikunja/vikunja/pulls/2196
Co-authored-by: kolaente <k@knt.li>
Co-committed-by: kolaente <k@knt.li>

frontend/src/components/tasks/partials/comments.vue

@@ -97,6 +97,12 @@
 							editComment()
 						}"
 					/>
+					<Reactions 
+						v-model="c.reactions"
+						class="mt-2" 
+						entity-kind="comments"
+						:entity-id="c.id"
+					/>
 				</div>
 			</div>
 			<div
@@ -190,6 +196,7 @@ import {formatDateLong, formatDateSince} from '@/helpers/time/formatDate'
 import {getAvatarUrl, getDisplayName} from '@/models/user'
 import {useConfigStore} from '@/stores/config'
 import {useAuthStore} from '@/stores/auth'
+import Reactions from '@/components/input/Reactions.vue'
 
 const props = defineProps({
 	taskId: {