This changes the signature of InspectorSession.post_message to take a
&str rather than a String avoiding the need call str.to_string at each
call site.
This extracts the inspector session specific bits from CoverageCollector
into a standalone struct dubbed `InspectorSesssion` which can be used as
a general purpose session to communicate with the inspector on the same
thread as an isolate/inspector pair lives on.
Previously when we used the websocket to talk to the inspector we used
the runtime domain to send a "runIfWaitingForDebugger" message.
However this is not required since we now talk to the inspector directly
and no longer send said message so this removes the enabling of the
domain entirely.
This removes the dependency on global state and instead relies on the
runtime's internal state to get the script sources it saw when it
collected code coverage for them.
This commit adds basic support for collecting coverage
data using "deno test".
Currently the report is only a text added to the end
of output from "deno test".
