feat: report environment metrics api

[Zaimwa9]

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• I have added information to docs/ if required so people know about the feature!
• I have filled in the "Changes" section below?
• I have filled in the "How did you test this code" section below?
• I have used a Conventional Commit title for this Pull Request

Changes

Aim of this PR is to provide an endpoint returning a set of environment-level metrics:

• Total features

• Features enabled

• Segment override

• Identity override (not yet implemented)

• Open change requests

• Scheduled change to come

• Created a metric nested within environment view

/api/v1/environments/<environment_api_key>/metrics/	
environments.views.EnvironmentMetricsViewSet	
api-v1:environments:environment-metrics-list

• Added environment model methods to aggregate the metrics
• Added serializers and service methods

Payload example:

{
    "metrics": [
        {
            "value": 3,
            "description": "Total features",
            "name": "total_features",
            "disabled": false,
            "entity": "features",
            "rank": 1
        },
        {
            "value": 2,
            "description": "Features enabled",
            "name": "enabled_features",
            "disabled": false,
            "entity": "features",
            "rank": 2
        },
        {
            "value": 0,
            "description": "Segment Overrides",
            "name": "segment_overrides",
            "disabled": false,
            "entity": "segments",
            "rank": 3
        },
        {
            "value": 1,
            "description": "Open change requests",
            "name": "open_change_requests",
            "disabled": false,
            "entity": "change_requests",
            "rank": 4
        },
        {
            "value": 1,
            "description": "Total scheduled changes",
            "name": "total_scheduled_changes",
            "disabled": false,
            "entity": "scheduled_changes",
            "rank": 5
        }
    ]
}

How did you test this code?

• New tests
• Via requests

http://localhost:8000/api/v1/environments/<EnvID>/metrics/

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[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-5430	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-5430	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-5430	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5430	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5430	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-5430	Finished ✅	Results ✅

[github-actions]

Uffizzi Ephemeral Environment Deploying

☁️ https://app.uffizzi.com/github.com/Flagsmith/flagsmith/pull/5430

⚙️ Updating now by workflow run 14887281399.

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[github-actions]

Uffizzi Ephemeral Environment Deploying

☁️ https://app.uffizzi.com/github.com/Flagsmith/flagsmith/pull/5430

⚙️ Updating now by workflow run 14907622421.

What is Uffizzi? Learn more!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.64%. Comparing base (1d98d27) to head (559cee7).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5430      +/-   ##
==========================================
+ Coverage   97.62%   97.64%   +0.01%     
==========================================
  Files        1239     1242       +3     
  Lines       43089    43220     +131     
==========================================
+ Hits        42066    42202     +136     
+ Misses       1023     1018       -5     

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