Extract adm2 summaries to json

[Gabe-Levin]

What I changed

Extracted hardcoded ADM2 dataset config from client.py into a standalone ddh_datasets.json — single source of truth that supports multiple resource links per topic for upcoming multi-year datasets.

• New: ddh_datasets.json with description, metadata link, and datasets dict (year → resource ID)
• Replaced get_adm2_dataset_info() with get_adm2_datasets() — richer DataFrame output
• Added year parameter to get_adm2_summaries() (defaults to latest)
• Updated pyproject.toml, README, and tests

How to test

cd space2stats_client
python -m pytest tests/test_client.py -v -k "adm2"

from space2stats_client import Space2StatsClient
client = Space2StatsClient()
print(client.get_adm2_datasets())
df = client.get_adm2_summaries("population", iso3_filter="AND")

[github-actions]

PR Deployment Details:
🚀 PR deployed to https://brb7wvjtqb.execute-api.us-east-1.amazonaws.com/

[bpstewar]

In the get_adm2_summaries defintion, the dataset parameter has hard-coded options, which should pull from the ddh_datasets.json keys

[bpstewar]

Everything looks good, although we may need to make some updates after testing