Chore: Move workspace context (#675)

* move workspace context

* Update document-type-workspace.context.ts

* fix duplicate import

src/Umbraco.Web.UI.Client/libs/workspace/context/index.ts

@@ -1,2 +1,3 @@
 export * from './workspace-context.interface';
 export * from './workspace-entity-context.interface';
+export * from './workspace-context';

src/Umbraco.Web.UI.Client/libs/workspace/context/workspace-context.ts

@@ -0,0 +1,40 @@
+import { UmbEntityWorkspaceContextInterface } from './workspace-entity-context.interface';
+import { UmbContextProviderController, UMB_ENTITY_WORKSPACE_CONTEXT } from '@umbraco-cms/backoffice/context-api';
+import { UmbControllerHostElement } from '@umbraco-cms/backoffice/controller';
+import { UmbBooleanState } from '@umbraco-cms/backoffice/observable-api';
+import type { BaseEntity } from '@umbraco-cms/backoffice/models';
+
+/*
+
+TODO: We need to figure out if we like to keep using same alias for all workspace contexts.
+If so we need to align on a interface that all of these implements. otherwise consumers cant trust the workspace-context.
+*/
+export abstract class UmbWorkspaceContext<T, EntityType extends BaseEntity>
+	implements UmbEntityWorkspaceContextInterface<EntityType>
+{
+	public host: UmbControllerHostElement;
+	public repository: T;
+
+	#isNew = new UmbBooleanState(undefined);
+	isNew = this.#isNew.asObservable();
+
+	constructor(host: UmbControllerHostElement, repository: T) {
+		this.host = host;
+		this.repository = repository;
+		new UmbContextProviderController(host, UMB_ENTITY_WORKSPACE_CONTEXT, this);
+	}
+
+	getIsNew() {
+		return this.#isNew.getValue();
+	}
+
+	setIsNew(isNew: boolean) {
+		this.#isNew.next(isNew);
+	}
+
+	abstract getEntityId(): string | undefined; // COnsider if this should go away now that we have getUnique()
+	abstract getEntityType(): string; // TODO: consider of this should be on the repository because a repo is responsible for one entity type
+	abstract getData(): EntityType | undefined;
+	abstract save(): Promise<void>;
+	abstract destroy(): void;
+}