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/modelTypes/IReaction.ts

@@ -0,0 +1,14 @@
+import type {IAbstract} from '@/modelTypes/IAbstract'
+import type {IUser} from '@/modelTypes/IUser'
+
+export type ReactionKind = 'tasks' | 'comments'
+
+export interface IReaction extends IAbstract {
+	id: number
+	kind: ReactionKind
+	value: string
+}
+
+export interface IReactionPerEntity {
+	[reaction: string]: IUser[]
+}

frontend/src/modelTypes/ITask.ts

@@ -14,6 +14,7 @@ import type {IRepeatMode} from '@/types/IRepeatMode'
 
 import type {PartialWithId} from '@/types/PartialWithId'
 import type {ITaskReminder} from '@/modelTypes/ITaskReminder'
+import type {IReactionPerEntity} from '@/modelTypes/IReaction'
 
 export interface ITask extends IAbstract {
 	id: number
@@ -45,6 +46,8 @@ export interface ITask extends IAbstract {
 
 	position: number
 	kanbanPosition: number
+	
+	reactions: IReactionPerEntity
 
 	createdBy: IUser
 	created: Date

frontend/src/modelTypes/ITaskComment.ts

@@ -1,12 +1,15 @@
 import type {IAbstract} from './IAbstract'
 import type {IUser} from './IUser'
 import type {ITask} from './ITask'
+import type {IReactionPerEntity} from '@/modelTypes/IReaction'
 
 export interface ITaskComment extends IAbstract {
 	id: number
 	taskId: ITask['id']
 	comment: string
 	author: IUser
+	
+	reactions: IReactionPerEntity
 
 	created: Date
 	updated: Date