Add benchmarks for encode/decode

[h4sh3d]

Benchmark encode and decode functions with and without checksum.

[codecov-commenter]

Codecov Report

Merging #6 (940e295) into main (39626b7) will not change coverage.
The diff coverage is n/a.

❗ Current head 940e295 differs from pull request most recent head 0c61c74. Consider uploading reports for the commit 0c61c74 to get more accurate results

@@           Coverage Diff           @@
##             main       #6   +/-   ##
=======================================
  Coverage   97.57%   97.57%           
=======================================
  Files           1        1           
  Lines         494      494           
=======================================
  Hits          482      482           
  Misses         12       12           

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