azuread_user: support employee hire date

[kang8]

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Description

Support setting/getting employee hire date for azuread_user.

New or Affected Resource(s)

• azuread_user

Potential Terraform Configuration

resource "azuread_user" "example" {
  user_principal_name = "user1@domain.net"
  display_name        = "Test Manager"
  employee_hire_date  = "2014-01-03T00:00:00Z"
}

[kang8]

I will submit a PR to implement this field.