A {@link DataSchemaResolver} that searches the file system to locate a {@link NamedDataSchema}.
The possible locations to search are each search path appended with the transformed fully qualified name.
The name is transformed by replacing dot ('.') with {@link File#separator}, and appending the name with the specified file extension (provided to the constructor.) If a specific file extension is not provided, the default file extension is ".pdsc" (defined by the {@link #DEFAULT_EXTENSION} constant.)
For example, if path is "/a:/b/c", the extension is ".pdsc" and the name to find is "foo.bar.baz", then the possible locations to search are "/a/foo/bar/baz.pdsc" and "/b/c/foo/bar/baz.pdsc".
@author slim