Add reference data models and seed data for incoterms, invoice types, material types, payment methods, pedimento codes, pedimento regimens, sectors, states, transport modes, transport types, and valuation methods

- Implemented SQLAlchemy models for incoterms, invoice types, material types, payment methods, pedimento codes, pedimento regimens, sectors, states, transport modes, transport types, and valuation methods.
- Added seed data for each reference data model to populate the database with initial values.
- Ensured primary key constraints and appropriate data types for each model.
- Established relationships where necessary, particularly in pedimento codes and regimens.

backend/api/v1/modules/public/reference_data/states/models.py

@@ -0,0 +1,19 @@
+from typing import Optional
+from sqlalchemy import String, PrimaryKeyConstraint
+from sqlalchemy.orm import mapped_column, Mapped
+from core.database import Base
+
+class State(Base):
+    __tablename__ = "states" #GEstados
+    __table_args__ = (
+        PrimaryKeyConstraint('m3_key', 'description', name='states_pkey'),
+        {"schema": "public"}  
+    )
+
+    m3_key: Mapped[str] = mapped_column(String(3), nullable=False)
+    description: Mapped[str] = mapped_column(String(50), nullable=False)  # valor legal en español
+    mex_key: Mapped[Optional[str]] = mapped_column(String(3))
+    ame_key: Mapped[Optional[str]] = mapped_column(String(2))
+
+    def __repr__(self):
+        return f"<State(m3_key={self.m3_key}, description={self.description}, mex_key={self.mex_key}, ame_key={self.ame_key})>"

backend/api/v1/modules/public/reference_data/states/seed.py

@@ -0,0 +1,3 @@
+seed = [
+    
+]