LZ4FrameInputStream should read InputStream lazily

[bjmi]

Creating a new LZ4FrameInputStream instance already reads the underlying InputStream by calling nextFrameInfo().
This call should be deferred until an actual read(...) is performed i.e. separate instance creation and utilization.

Advantages

• If input is never read or used no resources or handles would be allocated.
• My use-case: underlying InputStream is not ready when creating LZ4FrameInputStream but actually is when used.

[odaira]

Fixed by 5e23573. Instance creation of LZ4FrameInputStream becomes 300x faster. Thanks for your suggestion!