Get basic Wasm runtime running

crates/runner/plugin/cargo_test.lua

@@ -1,5 +1,3 @@
-print("initializing plugin...")
-
 query = [[(
     (attribute_item
         (meta_item
@@ -10,13 +8,9 @@ query = [[(
 )]]
 
 function run_test(name)
-    print('running test `' .. name .. '`:')
     local command = 'cargo test -- ' .. name
     local openPop = assert(io.popen(command, 'r'))
     local output = openPop:read('*all')
     openPop:close()
-    print('done running test')
     return output
 end
-
-print("done initializing plugin.")