Make expect_that! more hygienic

related #475

I went for using fully qualified method names, rather than `use $crate::GoogleTestSupport as _;` since it's more hygienic.

`use $crate::GoogleTestSupport as _;` can cause issues, resulting in a conflict, if the user introduces another method with the same name as one on `GoogleTestSupport`

Author: eopb

googletest/src/assertions.rs

@@ -1511,8 +1511,7 @@ macro_rules! expect_that {
 
     // general case:
     ($actual:expr, $expected:expr $(,)?) => {{
-        use $crate::GoogleTestSupport as _;
-        $crate::verify_that!($actual, $expected).and_log_failure();
+        $crate::GoogleTestSupport::and_log_failure($crate::verify_that!($actual, $expected));
     }};
 
     // w/ format args, general case: