Add `MockOrderHeaderService` for submitting order headers to CBS
Part 1 of the sales order API for ECOM-422, the MockOrderHeaderService
.
Please review: @ahoffmann @lloyd-carter @weizhong-wang
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Part 1 of the sales order API for ECOM-422, the MockOrderHeaderService
.
Please review: @ahoffmann @lloyd-carter @weizhong-wang