Fetch workflows (GET api)

[kartikay101]

Updates :

Fixes #18

• Now uses a map and and array to preserve order as well. (sortBy, sortOrder)
• Switched syntax to an easy to parse string format
• Sample requests look like this GET {{host}}/workflows?pageNumber=0&pageSize=40&sortBy=name:desc;id:asc
• sortBy string is parsed and used in order of providing
• params validator ensures no illegal parameter gets through
• Does not support illegal sortBy Args (unlike last time, error is sent back if unknown params are passed)
• Switched filter naming to sortBy
• Key-references moved to postgres adapter

New Changes:

• Updated from primitives to Complex types for sortBy fields
• Changed sortBy fields delimiter from semicolon to comma

Updated query is : GET {{host}}/workflows?pageNumber=0&pageSize=40&sortBy=name:desc,id:asc

[kartikay101]

Latest Changes:

Updated from primitives to Complex types for sortBy fields Changed sortBy fields delimiter from semicolon to comma

[kartikay101]

Applied the patch. I think it is good to go