Add station search to enhydris_api_client (fixes DEV-129)

[aptiko]

No description provided.

[Copilot]

Pull Request Overview

This PR adds support for query string filtering to the list_stations() method in the Enhydris API client, allowing users to search for stations matching specific criteria.

• Added optional query_string parameter to list_stations() method
• URL-encodes the query string using quote_plus and appends it as a q parameter to the API endpoint
• Updated documentation to reflect the new parameter

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/enhydris_api_client/init.py	Added query_string parameter to list_stations() with URL encoding logic
tests/enhydris_api_client/test_station.py	Added test case to verify query string is properly encoded and included in the request
docs/enhydris_api_client.rst	Updated method signature and description to document the new parameter
CHANGELOG.rst	Added changelog entry for the new feature

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.84%. Comparing base (f82fe16) to head (e2bd1b9).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #59   +/-   ##
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  Coverage   95.84%   95.84%           
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  Files          19       19           
  Lines        2261     2263    +2     
=======================================
+ Hits         2167     2169    +2     
  Misses         94       94           

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