Updates to api_compare.py

[bryevdv]

This PR has minor updates/fixes for api_compare.py:

• Numpy 1.23 removed deprecated np.asscalar entirely
• Sphinx ext support code moved to private module

With these changes the script is functional again:

gas38 ❯ legate scripts/api_compare.py 
group,numpy,cunumeric,cupy
Convolve and Correlate,2,1,2
Ufuncs,91,87,86
Logical operations,14,12,11
Einsum and related,6,6,6
Discrete Fourier transform,18,14,18
Set operations,7,1,3
Array manipulation,48,25,41
Array manipulation (ndarray),1,1,1
Factorizations,2,1,2
SVD and related,4,0,4
Eigenvalues,4,0,2
LU factorization and related,6,0,6
Input and output,20,0,17
Input and output (ndarray),2,2,2
Array creation,29,17,25
Array creation (ndarray),1,1,1
Mathematical functions,30,7,27
"Searching, sorting, and counting",18,12,18
Advanced statistics,22,2,19
Miscellaneous matrix routines,1,0,1
Packing and unpacking bits,2,2,2
Indexing,23,7,16
Padding arrays,1,0,1
Random sampling,51,5,49
Functional programming,4,0,2

[ipdemes]

thank you for the fix!