Optimize the configuration iterator in FileSystem provider

[yuqi1129]

The following code is very time-consuming in FileSystemProvider like HDFSFileSystemProvider and needs to be optimized according to performance test:

    Configuration configuration = new Configuration();
    config.forEach(
        (k, v) -> {
          configuration.set(k.replace(GRAVITINO_BYPASS, ""), v);
        });

The operation configuration.set() will take much time.

We can convert the map to an XML stream and store the XML stream in the configuration only once.

[sunxiaojian]

@yuqi1129 please assign it to me.