Handle elementwise array math

[BioTurboNick]

This PR partially resolves #11 by handling the elementwise array operations, and erroring if checked_mul is attempted on two arrays.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 4 lines in your changes are missing coverage. Please review.

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❗ Current head 3028a82 differs from pull request most recent head 1787e21

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Files	Patch %	Lines
src/abstractarraymath_ext.jl	66.66%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #13   +/-   ##
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  Coverage        ?   71.89%           
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  Files           ?        4           
  Lines           ?      153           
  Branches        ?        0           
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  Hits            ?      110           
  Misses          ?       43           
  Partials        ?        0           

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