feat: Implement Enterprise SCIM - Get a Group or User

[elminster-aom]

Related with #3813

From REST API endpoints for Enterprise SCIM docs, implements:

• Get SCIM provisioning information for an enterprise group, GET /scim/v2/enterprises/{enterprise}/Groups/{scim_group_id}

• Get SCIM provisioning information for an enterprise user, GET /scim/v2/enterprises/{enterprise}/Users/{scim_user_id}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.54%. Comparing base (ecab7f1) to head (7ecf378).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@## master #3889 +/- ##
==========================================
+ Coverage 92.48% 92.54% +0.06% 
==========================================
Files 200 200 Lines 14564 14734 +170 ==========================================
+ Hits 13469 13636 +167 - Misses 895 897 +2 - Partials 200 201 +1 

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[gmlewis]

Thank you, @elminster-aom!
LGTM.
Awaiting second LGTM+Approval from any other contributor to this repo before merging.

cc: @stevehipwell - @alexandear - @zyfy29

[gmlewis]

Thank you, @alexandear!
Merging.