Ability to edit and save "Case definitions"

[aninek]

Purpose:
Recognizing that standard approaches may not reflect local realities, Data owners may need to allow teams to change the pre-filled Case definition of a Health risk.

• Allow user to select "Edit"
• User selects form field and can rewrite the [Case definition]
• User must record a reason why the [case definition] is being changed (comment field)
• System records; new case definition (without overwriting original), timestamp, user details, project affiliation, and comment.

Related to #54 and #60

[karolikl]

Related to #332

[alexanderhoset]

Is it ok if I re-write this to fit the mvp design @karolikl ? Case definitions is an meta data to a health risk, not a separate thing

[eprom]

@aninek Could you define what a "user" is since this involves access control checks on the backend.