Support Industry-standard message responses (such as HL7v2 ACK)

[Mario Lorenzo]

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Currently LFH returns a message body that does not comply with some industry standards such as HL7 message protocol. This issue can be broken down to address different protocol in a case-by-case basis.
As an example, HL7v2 requires that messages that are successful (or failed) be returned in HL7 message format such as ACK response. This would allow for better compatibility with existing systems that leverage those responses in order to perform audit or retry logic etc.

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Implement protocol responses for each route as appropriate.

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None.
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