Initial awsJson 1.0 and 1.1 server implementation (#1279)

To support these new protocols, we also changed the runtime Router definition as for both awsJson 1.0 and 1.1, every request MUST be sent to the root URL (/) using the HTTP "POST" method.

The runtime Router now supports explicitly all the available protocols.

There are still some protocol tests failing for awsJson 1.0 and 1.1. The failure are caused by the missing implementation of @endpoint trait and date parsing. Protocol tests for these 2 protocols are heavily biased towards Responses. Before announcing support for awsJson 1.0 and 1.1, we should increase the protocol tests coverage.

Signed-off-by: Bigo <1781140+crisidev@users.noreply.github.com>
Co-authored-by: david-perez <d@vidp.dev>