Extend methods for _FType and _CType

[ytdHuang]

Checklist

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Description

This PR supports Complex{Int32} and Complex{Int64} for _FType and _CType.

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 92.55%. Comparing base (9d1cb6b) to head (4354d96).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/utilities.jl	25.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #320      +/-   ##
==========================================
- Coverage   93.21%   92.55%   -0.67%     
==========================================
  Files          36       36              
  Lines        2581     2578       -3     
==========================================
- Hits         2406     2386      -20     
- Misses        175      192      +17     

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