support processing lzop compressed files (`.lzo`)

[jtmoon79]

Support processing .lzo files compressed by lzop.

However, such compression appears rarely used for log files so this is lower priority than other similar file-parser Issues.

Rust crates available:

• lzokay
  This crate includes a pure rust port of lzokay, which is a C++ implementation of the LZO compression format.