Feature: Add "amount type" configuration column for CSV imports (#1947)

* Rough draft

* Schema conflict update

* Implement signage

* Update system tests

* Lint fixes

app/controllers/import/configurations_controller.rb

@@ -36,7 +36,9 @@ class Import::ConfigurationsController < ApplicationController
         :currency_col_label,
         :date_format,
         :number_format,
-        :signage_convention
+        :signage_convention,
+        :amount_type_strategy,
+        :amount_type_inflow_value,
       )
     end
 end