Added ArraySymbol and ArrayElement

[Upabjojr]

• tensor
  • Introduced objects ArraySymbol and ArrayElement for array expressions equivalent to MatrixSymbol and MatrixElement in the matrix expression module.

[sympy-bot]

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• tensor
  • Introduced objects ArraySymbol and ArrayElement for array expressions equivalent to MatrixSymbol and MatrixElement in the matrix expression module. (#20943 by @Upabjojr)

This will be added to https://github.com/sympy/sympy/wiki/Release-Notes-for-1.8.

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<!-- BEGIN RELEASE NOTES -->
* tensor
  * Introduced objects ArraySymbol and ArrayElement for array expressions equivalent to MatrixSymbol and MatrixElement in the matrix expression module.
<!-- END RELEASE NOTES -->

Update

The release notes on the wiki have been updated.