Add Census population projections source package (#43)

Author: MaxGhenis

arch/source_package.py

@@ -90,6 +90,9 @@
     ),
     "census-pep-2024-national-age-sex": Path("census/pep_2024_national_age_sex"),
     "census-pep-2024-state-age-sex": Path("census/pep_2024_state_age_sex"),
+    "census-population-projections-2023": Path(
+        "census/population_projections_2023"
+    ),
     "census-stc-individual-income-tax": Path(
         "census/stc_individual_income_tax"
     ),

db/data/census/population_projections_2023/manifest.yaml

@@ -0,0 +1,18 @@
+source_id: census-population-projections
+package_id: census-population-projections-2023
+dataset: census_population_projections_2023
+source_page: https://www.census.gov/data/datasets/2023/demo/popproj/2023-popproj.html
+table: 2023 National Population Projections Main Series, middle series
+files:
+  2023:
+    filename: np2023_d5_mid.csv
+    source_url: https://www2.census.gov/programs-surveys/popproj/datasets/2023/2023-popproj/np2023_d5_mid.csv
+    sha256: 07099471f96a2146d65138de6102f77f395c7f9904f5ac069b08b845cdbf8fc3
+    size_bytes: 1522877
+    fetched_at: '2026-05-11T20:32:11+00:00'
+    storage:
+      r2:
+        provider: r2
+        bucket: arch-raw
+        key: raw/census/census-population-projections-2023/2023/07099471f96a2146d65138de6102f77f395c7f9904f5ac069b08b845cdbf8fc3/np2023_d5_mid.csv
+        uri: r2://arch-raw/raw/census/census-population-projections-2023/2023/07099471f96a2146d65138de6102f77f395c7f9904f5ac069b08b845cdbf8fc3/np2023_d5_mid.csv