[TACKLE-9] Get and create application assessment

[mrizzi]

1. Create API operation and backend to return a list of 1 element of AssessmentHeader when requested assessments for an specific application.

verb : GET
query params : applicationId
path params : - none -
response codes : http 200
response body : JSON : array of ( id, applicationId, status, name, notes )

2. Given an applicationId create API and backend implementation operation to create a new assessment.

verb: POST
query params : -none-
path params: -none-
response codes : 201, 400
response body: AssessmentHeader ( id, applicationId, status, name, notes )

NOTEs : at this sprint , backend will not trigger the process to flatten the questionaire into the assessment

[jonathanvila]

outdated and already covered by #7 #11 #12 and #25