[Chapel Merge] Matrix exponentiation using Scaling and Squaring A

Branch: refs/heads/master
Revision: 528273e
Author: lydia-duncan
Log Message:

Merge pull request #17523 from prashanth018/mat_expo_1

Matrix exponentiation using Scaling and Squaring Algorithm.
[contributed by @prashanth018 and reviewed by Lydia and @npadmana]

'expm' method takes in an N*N array as an argument and returns an exponentiated
matrix of same dimension. Time Complexity of this approach is approximately O(15.n^3)

[1] Awad H. Al-Mohy and Nicholas J. Higham (2009)
"A New Scaling and Squaring Algorithm for the Matrix Exponential."
SIAM Journal on Matrix Analysis and Applications.
31 (3). pp. 970-989. ISSN 1095-7162

Passed a full paratest with futures and the built docs look good

Modified Files:
A test/library/packages/LinearAlgebra/correctness/no-dependencies/testExpm.chpl

A test/library/packages/LinearAlgebra/correctness/no-dependencies/testExpm.good
M modules/packages/LinearAlgebra.chpl

Compare: https://github.com/chapel-lang/chapel/compare/5ddfe9fa3f52...528273e64a1d