feat(MongoDb Node): Add Aggregate Operation

* MongoDB Aggregate Option

* ⚡ small improvements to UI

Co-authored-by: Michael Kret <michael.k@radency.com>

packages/nodes-base/nodes/MongoDb/mongo.node.options.ts

@@ -29,6 +29,11 @@ export const nodeDescription: INodeTypeDescription = {
 			name: 'operation',
 			type: 'options',
 			options: [
+				{
+					name: 'Aggregate',
+					value: 'aggregate',
+					description: 'Aggregate documents.',
+				},
 				{
 					name: 'Delete',
 					value: 'delete',
@@ -63,6 +68,30 @@ export const nodeDescription: INodeTypeDescription = {
 			description: 'MongoDB Collection',
 		},
 
+		// ----------------------------------
+		//         aggregate
+		// ----------------------------------
+		{
+			displayName: 'Query',
+			name: 'query',
+			type: 'json',
+			typeOptions: {
+				alwaysOpenEditWindow: true,
+			},
+			displayOptions: {
+				show: {
+					operation: [
+						'aggregate',
+					],
+				},
+			},
+			default: '',
+			placeholder: `[{ "$match": { "$gt": "1950-01-01" }, ... }]`,
+			hint: 'Learn more about aggregation pipeline <a href="https://docs.mongodb.com/manual/core/aggregation-pipeline/">here</a>',
+			required: true,
+			description: 'MongoDB aggregation pipeline query in JSON format',
+		},
+
 		// ----------------------------------
 		//         delete
 		// ----------------------------------
@@ -149,6 +178,7 @@ export const nodeDescription: INodeTypeDescription = {
 			required: true,
 			description: 'MongoDB Find query.',
 		},
+
 		// ----------------------------------
 		//         insert
 		// ----------------------------------