Return serialised case items when creating them with POST

[cptanalatriste]

Before this PR, case item creation with POST only returned id and name. Now, we return a complete serialised case item. We also addressed the missing type value for strategies when retrieving cases.

[coveralls]

Pull Request Test Coverage Report for Build 9699800060

Details

• 101 of 101 (100.0%) changed or added relevant lines in 4 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+2.4%) to 85.164%

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Files with Coverage Reduction	New Missed Lines	%
eap_backend/eap_api/view_utils.py	2	75.4%
<!--	Total:	2		-->

Totals
Change from base Build 9666427857:	2.4%
Covered Lines:	1504
Relevant Lines:	1766

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💛 - Coveralls