[JAR-09] Create new Association

Create new association (as Admin only)

AS Louis, main admin I WANT TO create easily new association SO THAT I CAN populate my database directly from the user interface

Field	Placeholder	Pattern	Requirements
NAME	" association name "	text	required - max(40) - unique
CODE	" association unique code "	letter	required - max(5) - unique
DESCRIPTION	" Provide a description "	text	max(255)
LINK	" Provide a donation link "	url	required

[x] Association code & name must be unique
[x] If no errors occurred, the modal will close, and the created association is added to 'association-office' component view table
[x] If some errors occurred, the modal will stay open, and the snack bar will show all errors returned by API