FEAT: Adding Support for  scanfunc and fromstr ArrayFunc
          #214
        
          
      
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This PR is a part of work, where making
numpy_quaddtypecompatible with NumPy's longdouble testsCopilot Summary
This pull request adds robust string and file parsing support for the quad-precision NumPy dtype, enabling users to reliably load and save quad-precision arrays using text-based methods such as
np.fromstringandnp.fromfile. The changes include new C implementations for parsing from strings and files, integration of these functions into the dtype definition, and comprehensive test suites to verify parsing accuracy and edge case handling.Quad-precision parsing functionality:
quadprec_scanfuncandquadprec_fromstrC functions to parse quad-precision values from files and strings for both Sleef and native backends (quaddtype/numpy_quaddtype/src/dtype.c).QuadPrecDType_Slots(quaddtype/numpy_quaddtype/src/dtype.c).<ctype.h>for whitespace handling in parsing routines (quaddtype/numpy_quaddtype/src/dtype.c).Testing and validation:
TestStringParsingandTestFileIOclasses with extensive tests for string and file parsing, covering simple values, high precision, scientific notation, negative values, separators, roundtrips, empty files, and edge cases (quaddtype/tests/test_quaddtype.py).