Fix: logspace generate wrong result for integer arguments

[MadhurKumar004]

This resolves the issue of logspace giving wrong result. Please review if the approach is right
Fix: #1055

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.55%. Comparing base (eec591d) to head (d082e96).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1129   +/-   ##
=======================================
  Coverage   68.55%   68.55%           
=======================================
  Files         396      396           
  Lines       12746    12746           
  Branches     1376     1376           
=======================================
  Hits         8738     8738           
  Misses       4008     4008           

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[Copilot]

Pull request overview

This pull request fixes a bug in the logspace function where integer arguments caused integer overflow and produced incorrect results. The issue occurred because integer exponents were being computed using integer arithmetic before being raised to powers, leading to overflow for large values.

Changes:

• Changed exponent arrays from integer to real/complex types to avoid integer overflow
• Updated return type of integer+integer variant from integer to real(dp)
• Added explicit endpoint setting to maintain numerical precision at boundaries

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/math/stdlib_math_logspace.fypp	Modified three integer-argument procedures to use real/complex exponent arrays and convert integer inputs to real before calling linspace, preventing integer overflow
src/math/stdlib_math.fypp	Updated function signature for integer start/end/base variant to return real(dp) instead of integer, with corresponding comment update

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