Added batch remove table rows function

[KrystianNiepsuj]

• Added new function (Remove-AzTableRows) to handle deleting items in a
  batch for faster and more consistent performance. The batching process
  handles grouping items by partition key.

• Added pester v4 tests to tests file to include test coverage of the
  batching function

[KrystianNiepsuj]

Hi Paulo,
I was recently having issues removing items efficiently on a project I was working on. I have added this function and wanted to include it - in case it can be helpful to anyone else. Although github reports large amounts of changes - i changed nothing other than adding a function to the AzureRmStorageTableCoreHelper module, the tests module, and the psd1 file.

I considered adding this to the Remove-AzTableRow function - but with the additional logic I felt like it would clobber up the size of that function to a degree that was uncomfortable. Please let me know if you feel I should make any changes or if you disagree with this feature. Thanks!

[paulomarquesc]

Hi @KrystianNiepsuj , thanks for the contribution, I will evaluate, but would like to check if you can clean up with a new PR since it shows that everything is a new file. This will help future references to the PR.

Another question is, there is this PR #69 , which seems interesting and I'm interested on that approach, is that something you could use for the batch deletions?

[paulomarquesc]

@KrystianNiepsuj , I had a quick look at this, can you please rename the cmdlet to something like Remove-AzTableRowBatch instead of using plural? Plurals are not compliant with PowerShell design guidelines.