492 fiware secure header does not support dynamic update

[djs0109]

closes #492

[Copilot]

Pull request overview

This PR addresses #492 by ensuring FIWARE headers (including dynamically computed secure tokens) are composed at request time rather than being snapshotted at client initialization.

Changes:

• Added a central BaseHttpClient.request() helper that re-dumps fiware_headers for every outgoing call, and refactored HTTP verb helpers to use it.
• Refactored NGSI v2 / NGSI-LD pagination helpers to route through the centralized request path.
• Added a unit test for dynamic header refresh behavior and updated the secure-header example + changelog.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
filip/clients/base_http_client.py	Introduces per-request FIWARE header injection and routes all HTTP verbs through a shared request helper.
filip/clients/ngsi_v2/cb.py	Pagination now uses the shared request helper (and thus the new header injection behavior).
filip/clients/ngsi_ld/cb.py	Same pagination refactor as NGSI v2, via the shared request helper.
filip/clients/ngsi_v2/iota.py	Adjusts service/path checks to use fiware_service properties; tweaks admin log header handling.
tests/clients/test_ngsi_v2_client.py	Adds a regression test ensuring Authorization is recomputed per request.
examples/ngsi_v2/e13_ngsi_v2_secure_fiware_headers.py	Updates example to demonstrate request-time token refresh using a Keycloak-backed computed header.
CHANGELOG.md	Notes the dynamic header composition fix.

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