fixed LZ4 plugin

[captainkirk99]

Fixes for the LZ4 plugin. Fixes #200

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Important

Fix and optimize LZ4 plugin by removing static keyword, initializing blockSize, using LZ4_compress_fast, and commenting out debug prints in H5Z_filter_lz4.

• Function Changes:
  • Remove static keyword from H5Z_filter_lz4 declaration and definition in H5Zlz4.c.
  • Initialize blockSize to DEFAULT_BLOCK_SIZE in forward filter path.
  • Use LZ4_compress_fast instead of LZ4_compress_default in H5Z_filter_lz4.
• Misc:
  • Comment out debug printf statements in H5Z_filter_lz4 for decompression size mismatch and block size information.

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[captainkirk99]

I would like to get a CI running before submitting this PR (see #201).

[captainkirk99]

OK, approve my workflow runs and we'll see how the CI likes these changes...