feat: add specialist, subspecialist and division handlers

app/models/division.ts

@@ -0,0 +1,4 @@
+export interface Division {
+  code: string
+  name: string
+}

app/models/subspecialist.ts

@@ -0,0 +1,5 @@
+export interface Subspecialist {
+  code: string
+  name: string
+  unit_id: number
+}