Make the logger customisable

Add a new `--log-format` cli argument to change the format of the logs.
The possible values are
- raw (the default one for old-style commands)
- bar (the default one for new-style commands)
- bar-with-logs (equivalent to `--print-build-logs`)
- internal-json (the internal machine-readable json format)

src/nix-build/nix-build.cc

@@ -472,6 +472,8 @@ static void _main(int argc, char * * argv)
 
         restoreSignals();
 
+        logger->stop();
+
         execvp(shell->c_str(), argPtrs.data());
 
         throw SysError("executing shell '%s'", *shell);
@@ -521,6 +523,8 @@ static void _main(int argc, char * * argv)
             if (auto store2 = store.dynamic_pointer_cast<LocalFSStore>())
                 store2->addPermRoot(store->parseStorePath(symlink.second), absPath(symlink.first), true);
 
+        logger->stop();
+
         for (auto & path : outPaths)
             std::cout << path << '\n';
     }