Split http module into multiple files

Signed-off-by: Brian Grenier <[email protected]>

lightbug_http/header.mojo

@@ -11,6 +11,7 @@ struct HeaderKey:
     alias CONTENT_TYPE = "content-type"
     alias CONTENT_LENGTH = "content-length"
     alias CONTENT_ENCODING = "content-encoding"
+    alias TRANSFER_ENCODING = "transfer-encoding"
     alias DATE = "date"
     alias LOCATION = "location"
     alias HOST = "host"

lightbug_http/http/__init__.mojo

@@ -0,0 +1,13 @@
+from .common_response import *
+from .response import *
+from .request import *
+
+
+@always_inline
+fn encode(owned req: HTTPRequest) -> Bytes:
+    return req._encoded()
+
+
+@always_inline
+fn encode(owned res: HTTPResponse) -> Bytes:
+    return res._encoded()