[ECOM-423] Add `SoapOrderHeaderService`
This PR adds the SoapOrderHeaderService
using the new WSDL provided by @lloyd-carter.
Please review: @ahoffmann @weizhong-wang @lloyd-carter
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This PR adds the SoapOrderHeaderService
using the new WSDL provided by @lloyd-carter.
Please review: @ahoffmann @weizhong-wang @lloyd-carter