Start moving out URI from ConnectionContext

Create connections with an initial context. Database will set itself as context after connection has been created

spec/custom_drivers_types_spec.cr

@@ -48,7 +48,7 @@ class FooDriver < DB::Driver
   end
 
   def build_connection(context : DB::ConnectionContext) : DB::Connection
-    FooConnection.new(context)
+    FooConnection.new
   end
 
   class FooConnection < DB::Connection
@@ -111,7 +111,7 @@ class BarDriver < DB::Driver
   end
 
   def build_connection(context : DB::ConnectionContext) : DB::Connection
-    BarConnection.new(context)
+    BarConnection.new
   end
 
   class BarConnection < DB::Connection

spec/dummy_driver.cr

@@ -3,12 +3,11 @@ require "../src/db"
 
 class DummyDriver < DB::Driver
   def build_connection(context : DB::ConnectionContext) : DB::Connection
-    DummyConnection.new(context)
+    DummyConnection.new
   end
 
   class DummyConnection < DB::Connection
-    def initialize(context)
-      super(context)
+    def initialize
       @connected = true
       @@connections ||= [] of DummyConnection
       @@connections.not_nil! << self