Cast port to integer in connection options

Support string ports to make ENV config passing easier. Other gems like
mysql2 support this use-case, so I think trilogy should too.

contrib/ruby/lib/trilogy.rb

@@ -8,6 +8,7 @@
 
 class Trilogy
   def initialize(options = {})
+    options[:port] = options[:port].to_i if options.key?(:port)
     mysql_encoding = options[:encoding] || "utf8mb4"
     encoding = Trilogy::Encoding.find(mysql_encoding)
     charset = Trilogy::Encoding.charset(mysql_encoding)

contrib/ruby/test/client_test.rb

@@ -1057,4 +1057,17 @@ def test_character_encoding_handles_binary_queries
     assert_equal expected.dup.force_encoding(Encoding::Windows_31J), result
     assert_equal Encoding::Windows_31J, result.encoding
   end
+
+  def test_connection_options_casting
+    options = {
+      host: DEFAULT_HOST,
+      port: DEFAULT_PORT.to_s,
+      username: DEFAULT_USER,
+      password: DEFAULT_PASS,
+      ssl: "1",
+    }
+    client = new_tcp_client(**options)
+
+    assert client.query("SELECT 1")
+  end
 end