5425 - Introducing support for all Composite Fields Import (#5470)

Adding support for all Composite Fields while using the "import"
functionality. This includes:
- Currency
- Address

Edit : 
- Refactored a lot of types in the spreadsheet import module
- Renamed a lot of functions, hooks and types that were not
self-explanatory enough

---------

Co-authored-by: Charles Bochet <charles@twenty.com>
Co-authored-by: Félix Malfait <felix.malfait@gmail.com>
Co-authored-by: Lucas Bordeau <bordeau.lucas@gmail.com>

packages/twenty-front/src/utils/castToString.ts

@@ -0,0 +1,3 @@
+export const castToString = (value: any) => {
+  return String(value ?? '');
+};