[chores] Standardized REST API pagination

[nemesifier]

Checklist

• I have read the OpenWISP Contributing Guidelines.
• I have manually tested the changes proposed in this pull request.
• N/A I have written new test cases for new code and/or updated existing tests for changes to existing code.
• N/A I have updated the documentation.

Reference to Existing Issue

References openwisp/openwisp-utils#586.

Description of Changes

Replaces endpoint-specific DRF paginator classes with the shared OpenWispPagination implementation introduced in openwisp/openwisp-utils#587.

This change reduces duplication and keeps pagination behavior consistent across OpenWISP modules.

Screenshot

N/A.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 9c0cd80f-c8c3-43d3-91f3-97471af71143

📥 Commits

Reviewing files that changed from the base of the PR and between e7624bb and 638a521.

📒 Files selected for processing (1)

• openwisp_ipam/api/views.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch utils-pagination

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