Add clear_libsif and manage_libsif

[amontoison]

close #180

[codecov]

Codecov Report

Attention: Patch coverage is 1.38889% with 71 lines in your changes missing coverage. Please review.

Project coverage is 74.04%. Comparing base (f2ad6a4) to head (48769f3).
Report is 83 commits behind head on main.

Files	Patch %	Lines
src/sifdecoder.jl	0.00%	69 Missing ⚠️
src/CUTEst.jl	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #401       +/-   ##
===========================================
- Coverage   89.11%   74.04%   -15.07%     
===========================================
  Files           5        8        +3     
  Lines         790     1626      +836     
===========================================
+ Hits          704     1204      +500     
- Misses         86      422      +336     

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