Fix 227 5010 x212

[fiacremccullough]

I had to make some changes to the existing 277 5010 x212 mapping to get it to work .
I also reformatted the file to make it easier to navigate .. this is the bulk of the change.

The changes to get the mapping working are

• adding a footer
• changing mapping type from incorrect 005010X218 to 005010X212
• changing GS loop code RA -> HN ( this is according to the spec at https://x212.x12.org/ )

"The two-character Functional Identifier Code for the transaction set included in this implementation guide:
HR Health Care Claim Status Request (276)
HN Health Care Information Status Notification (277)"

[ctmay4]

@angelaszek this is waiting on your review

[angelaszek]

I am not an expert on this particular standard but I didn't see anything suspicious and a unit test with an example file was added so I think this is good.