Update a variable bug and extend the Int type of size_schur from 32 to 64

[hochunlin]

• Fix a variable name bug for Schur computation
• Extend the Int type of size_schur from 32 to 64 to support larger Schur computation

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 20.73%. Comparing base (48b0cda) to head (e548cc6).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
src/interface.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #144   +/-   ##
=======================================
  Coverage   20.73%   20.73%           
=======================================
  Files           6        6           
  Lines         791      791           
=======================================
  Hits          164      164           
  Misses        627      627           

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[amontoison]

Thank you!