Add Emergency Medicaid for undocumented immigrants

changelog_entry.yaml

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+- bump: minor
+  changes:
+    added:
+      - Add Emergency Medicaid eligibility for undocumented immigrants

policyengine_us/parameters/gov/hhs/medicaid/emergency_medicaid/enabled.yaml

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+description: The United States provides Emergency Medicaid for individuals who meet Medicaid eligibility requirements but for their immigration status.
+values:
+  0001-01-01: false
+  1987-01-01: true
+
+metadata:
+  unit: bool
+  period: year
+  label: Emergency Medicaid enabled
+  reference:
+    - title: 42 USC 1396b(v)(2) - Exception for Emergency Medical Services
+      href: https://www.law.cornell.edu/uscode/text/42/1396b#v
+    - title: 8 USC 1611(b)(1)(A) - Exception for Emergency Medical Care
+      href: https://www.law.cornell.edu/uscode/text/8/1611#b_1_A

policyengine_us/parameters/gov/hhs/medicaid/emergency_medicaid/uses_medicaid_income_thresholds.yaml

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+description: The United States requires Emergency Medicaid applicants to meet the same income thresholds as regular Medicaid for their eligibility category.
+values:
+  1987-01-01: true
+
+metadata:
+  unit: bool
+  period: year
+  label: Emergency Medicaid uses Medicaid income thresholds
+  reference:
+    - title: 42 USC 1396b(v)(2)(B) - Emergency Medicaid Eligibility Requirements
+      href: https://www.law.cornell.edu/uscode/text/42/1396b#v_2_B
+    - title: 42 CFR 435.406 - Citizenship and Noncitizen Eligibility
+      href: https://www.law.cornell.edu/cfr/text/42/435.406