Allow user to add buy and sell trade transactions for investment accounts (#1066)

* Consolidate modal form structure into partial + helper

* Scaffold out trade transaction form

* Normalize translations

* Add buy and sell trade form with tests

* Move entryable lists to dedicated controllers

* Delegate entry group contents rendering

* More cleanup

* Extract transaction and valuation update logic from entries controller

* Delegate edit and show actions to entryables

* Trade builder

* Update paths for transaction updates

db/migrate/20240807153618_add_currency_field_to_trade.rb

@@ -0,0 +1,5 @@
+class AddCurrencyFieldToTrade < ActiveRecord::Migration[7.2]
+  def change
+    add_column :account_trades, :currency, :string
+  end
+end