Add Elo rating system with match entry and CSV upload

- Implement EloCalculator service for 2v2 Euchre matches
- Create background job processing with GoodJob
- Add single match entry form
- Add CSV upload for batch match entry
- Create player rankings view
- Add database schema for matches and elo snapshots

app/repositories/matches.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+require 'rom-repository'
+
+module EuchreCamp
+  module Repositories
+    class Matches < ::EuchreCamp::Repository[:matches]
+      commands :create, update: :by_pk, delete: :by_pk
+
+      def all
+        matches.to_a
+      end
+
+      def by_id(id)
+        matches.by_pk(id).one!
+      end
+    end
+  end
+end