calculate derivative of trivial matrix power

[Upabjojr]

Warning: check the tests.

• matrices
  • added support for derivative of matrix scalar raised to non-integer powers.

[sympy-bot]

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• matrices
  • added support for derivative of matrix scalar raised to non-integer powers. (#16659 by @Sc0rpi0n101 and @Upabjojr)

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## Warning: check the tests.

<!-- BEGIN RELEASE NOTES -->
* matrices
  * added support for derivative of matrix scalar raised to non-integer powers.
<!-- END RELEASE NOTES -->

Update

The release notes on the wiki have been updated.

[codecov]

Codecov Report

Merging #16659 into master will decrease coverage by 0.003%.
The diff coverage is 100%.

@@              Coverage Diff              @@
##            master    #16659       +/-   ##
=============================================
- Coverage   73.813%   73.809%   -0.004%     
=============================================
  Files          619       619               
  Lines       159227    159241       +14     
  Branches     37370     37372        +2     
=============================================
+ Hits        117531    117535        +4     
- Misses       36262     36268        +6     
- Partials      5434      5438        +4

[Sc0rpi0n101]

One of the tests is failing because of a missing - sign

The rest of the tests passed locally after fixing that.

[Upabjojr]

Thanks @Sc0rpi0n101