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

app/models/account/trade.rb

@@ -1,10 +1,12 @@
 class Account::Trade < ApplicationRecord
-  include Account::Entryable
+  include Account::Entryable, Monetizable
+
+  monetize :price
 
   belongs_to :security
 
   validates :qty, presence: true, numericality: { other_than: 0 }
-  validates :price, presence: true
+  validates :price, :currency, presence: true
 
   class << self
     def search(_params)