feat(datagrid): add ability to unsort datagrid colums

[valentin-mladenov]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• If applicable, have a visual design approval

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Once turned on column sort can only be rotated between ASC and DESC when clicking on the column, but can't be turned off.

Issue Number: CDE-2439, CDE-2416

What is the new behavior?

Column sort can be turned off by clicking third time on the column.
The feature can be turned on by clrDgEnableUnsortColumns flag on datagrid level for entire datagrid.
The feature can be turned on/off per column by clrDgDisableUnsort flag on column level.

Does this PR introduce a breaking change?

• Yes
• No

Other information

[github-actions]

👋 @valentin-mladenov,

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[valentin-mladenov]

follow up of #1612