Add `securityAlertPolicies` in table azure_mysql_server and azure_mysql_flexible_server

[khushboo9024]

Is your feature request related to a problem? Please describe. Add securityAlertPolicies in table azure_mysql_server and azure_mysql_flexible_server

https://pkg.go.dev/github.com/Azure/azure-sdk-for-go@v58.0.0+incompatible/services/mysql/mgmt/2020-01-01/mysql#SecurityAlertPolicyProperties

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