feat: add get person by email to Copper

Copper 'Person' is more conveniently fetched by email (a unique key)
in most workflows. Add a getPersonByEmail via

https://developer.copper.com/people/fetch-a-person-by-email.html

packages/nodes-base/nodes/Copper/Copper.node.ts

@@ -422,6 +422,23 @@ export class Copper implements INodeType {
 						const personId = this.getNodeParameter('personId', i);
 
 						responseData = await copperApiRequest.call(this, 'GET', `/people/${personId}`);
+					} else if (operation === 'getByEmail') {
+						// ----------------------------------------
+						//               person: getByEmail
+						// ----------------------------------------
+
+						// https://developer.copper.com/people/fetch-a-person-by-email.html
+
+						const body: IDataObject = {
+							email: this.getNodeParameter('personEmail', i),
+						};
+
+						responseData = await copperApiRequest.call(
+							this,
+							'POST',
+							'/people/fetch_by_email',
+							body,
+						);
 					} else if (operation === 'getAll') {
 						// ----------------------------------------
 						//              person: getAll

packages/nodes-base/nodes/Copper/descriptions/PersonDescription.ts

@@ -33,6 +33,11 @@ export const personOperations: INodeProperties[] = [
 				value: 'get',
 				action: 'Get a person',
 			},
+			{
+				name: 'GetByEmail',
+				value: 'getByEmail',
+				action: 'Get a person by email',
+			},
 			{
 				name: 'Get Many',
 				value: 'getAll',
@@ -134,6 +139,24 @@ export const personFields: INodeProperties[] = [
 		},
 	},
 
+	// ----------------------------------------
+	//               person: getByEmail
+	// ----------------------------------------
+	{
+		displayName: 'Person Email',
+		name: 'personEmail',
+		description: 'Email of the person to retrieve',
+		type: 'string',
+		required: true,
+		default: '',
+		displayOptions: {
+			show: {
+				resource: ['person'],
+				operation: ['getByEmail'],
+			},
+		},
+	},
+
 	// ----------------------------------------
 	//              person: getAll
 	// ----------------------------------------