Branding-Email branding-Email general brand resource

Number of APIs: 3

1. Add and edit email general branding PUT {{url}}/v2/brands/{{brand_id}}/resources/email-general

2. Get email general resource GET {{url}}/v2/brands/{{brand_id}}/resources/email-general

3. Delete email general resource DELETE {{url}}/v2/brands/{{brand_id}}/resources/email-general