feat(Gmail Node): Add support for creating drafts using an alias (#8728)

Co-authored-by: Jonathan Bennetts <jonathan.bennetts@gmail.com>

packages/nodes-base/nodes/Google/Gmail/v2/GmailV2.node.ts

@@ -197,6 +197,27 @@ export class GmailV2 implements INodeType {
 
 				return returnData;
 			},
+
+			async getGmailAliases(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
+				const returnData: INodePropertyOptions[] = [];
+				const { sendAs } = await googleApiRequest.call(
+					this,
+					'GET',
+					'/gmail/v1/users/me/settings/sendAs',
+				);
+
+				for (const alias of sendAs || []) {
+					const displayName = alias.isDefault
+						? `${alias.sendAsEmail} (Default)`
+						: alias.sendAsEmail;
+					returnData.push({
+						name: displayName,
+						value: alias.sendAsEmail,
+					});
+				}
+
+				return returnData;
+			},
 		},
 	};
 
@@ -528,6 +549,7 @@ export class GmailV2 implements INodeType {
 						let cc = '';
 						let bcc = '';
 						let replyTo = '';
+						let fromAlias = '';
 						let threadId = null;
 
 						if (options.sendTo) {
@@ -546,6 +568,10 @@ export class GmailV2 implements INodeType {
 							replyTo = prepareEmailsInput.call(this, options.replyTo as string, 'ReplyTo', i);
 						}
 
+						if (options.fromAlias) {
+							fromAlias = options.fromAlias as string;
+						}
+
 						if (options.threadId && typeof options.threadId === 'string') {
 							threadId = options.threadId;
 						}
@@ -567,6 +593,7 @@ export class GmailV2 implements INodeType {
 						}
 
 						const email: IEmail = {
+							from: fromAlias,
 							to,
 							cc,
 							bcc,