add citizen_science scraper for taxila

[mikesndrs]

Checklist

• I have read and followed the CONTRIBUTING guide.
• I confirm that I have the authority necessary to make this contribution on behalf of its copyright owner and agree
  to license it to the TeSS codebase under the
  BSD license.

[Copilot]

Pull request overview

This PR adds a new Citizen Science web scraper (ingestor) for the Taxila framework that scrapes both events and materials from citizenscience.nl. The ingestor parses HTML pages to extract event data (including Dutch month translation) and material data (from resources and training resources pages), and is registered in the ingestor factory.

Changes:

• New CitizenScienceIngestor class that scrapes events from citizenscience.nl/events/ and materials from /resources and /training_resources pages
• Test file covering both event and material ingestion with VCR cassettes
• Registration of the new ingestor in the IngestorFactory

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 4 comments.

File	Description
lib/ingestors/taxila/citizen_science_ingestor.rb	New ingestor that scrapes citizen science events and materials from citizenscience.nl, with Dutch-to-English month mapping
test/unit/ingestors/taxila/citizen_science_ingestor_test.rb	Tests for both event ingestion (13 events) and material ingestion (25 new + 8 updated materials)
lib/ingestors/ingestor_factory.rb	Adds CitizenScienceIngestor to the Taxila ingestors list

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