feat: added advertiser and campaign apps

solution/services/backend/apps/campaign/forms.py

@@ -0,0 +1,35 @@
+from typing import Any
+
+from django import forms
+
+from apps.campaign.models import Campaign, CampaignReport
+
+
+class CampaignForm(forms.ModelForm):
+    class Meta:
+        model = Campaign
+        fields = "__all__"
+
+    def clean(self) -> dict[str, Any]:
+        cleaned_data = super().clean()
+        location = cleaned_data.get("location")
+
+        if location == "":
+            cleaned_data["location"] = None
+
+        return cleaned_data
+
+
+class CampaignReportForm(forms.ModelForm):
+    class Meta:
+        model = CampaignReport
+        fields = "__all__"
+
+    def clean(self) -> dict[str, Any]:
+        cleaned_data = super().clean()
+        message = cleaned_data.get("message")
+
+        if message == "":
+            cleaned_data["message"] = None
+
+        return cleaned_data