Add [igxColumnTemplate] to <igx-hierarchical-grid> and <igx-row-island>

[luiscla27]

Is your feature request related to a problem? Please describe.

This is related to question 9064, If I can't add recursive templates, it would be nice to at least reuse the same columns at each row island level.

Describe the solution you'd like

I would like to implement something similar to this:

<ng-template #columnsTemplate1>
  <igx-column header="Column 1" field="columnField1"></igx-column>
  <igx-column header="Column 2" field="columnField2"></igx-column>
  <igx-column header="Column 3" field="columnField3"></igx-column>
  <igx-column header="Column 4" field="columnField4"></igx-column>
</ng-template>
<ng-template #columnsTemplate2>
  <igx-column header="Column 5" field="columnField4"></igx-column>
  <igx-column header="Column 6" field="columnField5"></igx-column>
  <igx-column header="Column 7" field="columnField7"></igx-column>
  <igx-column header="Column 8" field="columnField8"></igx-column>
</ng-template>
<igx-hierarchical-grid [igxColumnTemplate]="columnsTemplate" igxPreventDocumentScroll class="hierarchicalGrid" primaryKey="levelId" [data]="localdata">
  <igx-row-island key="childs" [autoGenerate]="false" [igxColumnTemplate]="columnsTemplate1">
      <igx-row-island key="childs" [autoGenerate]="false" [igxColumnTemplate]="columnsTemplate1">
          <igx-row-island key="childs" [autoGenerate]="false" [igxColumnTemplate]="columnsTemplate2">
          </igx-row-island>
      </igx-row-island>
  </igx-row-island>
</igx-hierarchical-grid>

Describe alternatives you've considered

Currently I'm being forced to define every level even though they are all the same.

Additional context

Any alternative to encapsulate columns definitions would be ok.

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