Operational insights data export (Azure#8128)

* microsoft.operationalinsights_add_data_export

* fix

* fix

* fix readmfile + fix cSpell

* fix

* Revert "fix"

This reverts commit a23f53b.

* Fix azure-rest-api-specs-tests

* format

* Revert "format"

This reverts commit f39f5e4.

* Revert "Fix azure-rest-api-specs-tests"

This reverts commit 50cf6aa.

* prettifer

* Code review fixes

* Update OperationalInsights.json

* Make Destination type "readonly"

Co-authored-by: Arik Olsh <47111029+arolshan@users.noreply.github.com>