Update docs relating to proxies to Direct Proxies api

[ghost]

There's probably no reason to support legacy Proxies, rather Direct Proxies should be supported. This calls for the removal of proxyCallTrap and proxyConstructTrap and the addition of proxyTarget. parameterNames should, instead of returning an empty array, return what parameterNames would return for the target. I think the whole class of DebuggeeWouldRun errors that arise from the debuggee being a proxy could probably be removed by simply forwarding them all to the target. While this would not paint a completely accurate picture of the proxy, it's better than simply giving up.