Create player table, track player updates, fix match processing tracking

apps/lol_analytics/priv/repo/migrations/20240502203545_player.exs

@@ -0,0 +1,14 @@
+defmodule LoLAnalytics.Repo.Migrations.Player do
+  use Ecto.Migration
+
+  def change do
+    create table("player") do
+      add :puuid, :string
+      add :region, :string
+      add :last_processed_at, :utc_datetime
+      timestamps()
+    end
+
+    create index(:player, [:puuid])
+  end
+end