Domain verification

Operations for domain verification.

• GETDkim a domain/api/v1/domains/{domain}/dkim
• GETDns Provider a domain/api/v1/domains/{domain}/dns-provider
• GETGet the DNS records to publish/api/v1/domains/{domain}/dns-records
• GETVerification Status a domain/api/v1/domains/{domain}/verification-status
• POSTEmail the DNS records to somebody/api/v1/domains/{domain}/send-records
• POSTSync a domain/api/v1/domains/{domain}/sync
• POSTVerify a domain/api/v1/domains/{domain}/verify