COM-1164: Add support for importing multiselect enum values (#106)

## Description

Previously only string values could be imported in the contact import.
In case the project uses multiselect for certain contact attributes the
import was not working correctly and was throwing a validation error
since the attribute was a string but was expecting an array. Now the
contact attribute gets checked if it is supposed to be an array and gets
transformed to an array. The values need to be separated with a comma in
the import file.

## Example

[x] I have verified if my change requires an example


## Changeset

[x] I have verified if my change requires a changeset

## Related tasks and documents

COM-1164

---------

Co-authored-by: Denise Buder <[email protected]>

.changeset/wicked-doors-breathe.md

@@ -0,0 +1,7 @@
+---
+"@comet/brevo-api": patch
+---
+
+Support multiselect values in contact import
+
+Previously the contact import did not support multiselect values since brevo expects an array of values and the csv import only sent values as strings. Now the import value gets transformed to an array in case the contact attribute should be of type array. The value in the csv file's column needs to be separated with a comma in case of multiple selected values.

packages/api/src/brevo-contact/brevo-contact-import.service.ts

@@ -20,8 +20,7 @@ class BasicValidateableRow {
     @IsNotEmpty()
     email: string;
 
-    // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    [key: string]: string;
+    [key: string]: string | string[];
 }
 
 export interface CsvImportInformation {
@@ -165,6 +164,18 @@ export class BrevoContactImportService {
         return "error";
     }
 
+    private parseValue({ value, key }: { value: string; key: string }): string | string[] {
+        if (this.config.brevo.BrevoContactAttributes) {
+            const designType = Reflect.getMetadata("design:type", this.config.brevo.BrevoContactAttributes.prototype, key.toUpperCase())?.name;
+
+            if (designType === "Array") {
+                return value.trim() === "" ? [] : value.split(",").map((item) => item.trim());
+            }
+        }
+
+        return value;
+    }
+
     private async processCsvRow(row: Record<string, string>, redirectUrlForImport: string): Promise<CreateDoubleOptInContactData> {
         const mappedRow = this.createValidateableCsvRowClass();
 
@@ -174,7 +185,7 @@ export class BrevoContactImportService {
             if (key.toLowerCase() === "email") {
                 mappedRow.email = row[key];
             } else {
-                mappedRow[key.toUpperCase()] = row[key];
+                mappedRow[key.toUpperCase()] = this.parseValue({ value: row[key], key });
             }
         }