[IMP] Add image type enum and property in image_data

[lasley]

• Add an enum for the image types. Currently mapped are the distinct values from an existing prod, with the one known value filled (prescription). Pending response from CP on others
• Add image_type computed property in image_data that maps the type code using the enum

[codecov]

Codecov Report

Merging #40 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #40      +/-   ##
=========================================
+ Coverage   97.68%   97.7%   +0.01%     
=========================================
  Files          60      61       +1     
  Lines        1598    1610      +12     
  Branches       42      42              
=========================================
+ Hits         1561    1573      +12     
  Misses         20      20              
  Partials       17      17

Impacted Files	Coverage Δ
carepoint/models/cph/image_data.py	100% <100%> (ø)	⬆️
carepoint/models/enum_image_type.py	100% <100%> (ø)

[lasley]

To get the current list of these you can use the SQL below in the CPH database

select * from csct where ct_id = 420 (This will let you know that the CT_ID of 420 refers to image types.)

select * from csct_code where ct_id = 420 (The list of image types is defined in the csct_code table using the Code_num which you have below)

Example: Code of 2 in my database signifies an image listed as an RX.