MudDataGrid: Add ability to use SortBy on TemplateColumn.

[tjscience]

Description

You can now properly use SortBy on the TemplateColumn. Before, even though the parameter was exposed, it did not work because template columns do not have a PropertyName. I have implemented the PropertyName in TemplateColumn and set it to the column's hash code so that DataGrid has a reference to each template column when sorting.

How Has This Been Tested?

Visually. Also, added unit tests.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've added relevant tests.

[tjscience]

@ScarletKuro, @henon

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (a499a1a) 90.63% compared to head (184d91e) 90.63%.

❗ Current head 184d91e differs from pull request most recent head fe8eaa0. Consider uploading reports for the commit fe8eaa0 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #6613   +/-   ##
=======================================
  Coverage   90.63%   90.63%           
=======================================
  Files         399      399           
  Lines       13565    13566    +1     
=======================================
+ Hits        12294    12296    +2     
+ Misses       1271     1270    -1     

Impacted Files	Coverage Δ
...rc/MudBlazor/Components/DataGrid/TemplateColumn.cs	50.00% <100.00%> (+16.66%)	⬆️

... and 2 files with indirect coverage changes

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[ScarletKuro]

LGTM. Tho, in my head I was thinking more of using Guid than GetHashCode..

[henon]

MSDN under Remarks:

The default implementation of the GetHashCode method does not guarantee unique return values for different objects. Furthermore, the .NET Framework does not guarantee the default implementation of the GetHashCode method, and the value it returns will be the same between different versions of the .NET Framework. Consequently, the default implementation of this method must not be used as a unique object identifier for hashing purposes.

[henon]

LGTM, you decide about GetHashCode @tjscience

[tjscience]

In my opinion, we do not need a truly unique id like GUID here. We only need uniqueness among the columns in the datagrid at any given time which GetHashCode provides easily since each TemplateColumn will be a different reference. I will change it though. It is only one line of code.