Ability to filter on resource type for az group export

**Related command**

`az group export`

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

I am considering use of PSRule to test against the Well-Architected Framework. When calling `az group export` to get a template to run PSRule against, I got an error about the export not able to be performed because there are more than 200 resources. I know that the reason in this case is that each hosted API has multiple alert rules. The alert rules would not matter to me as much for running PSRule.

**Describe the solution you'd like**

If I could filter to exclude alert rules (and maybe other resource types), I would be able to extract this particular template (and maybe others) and run PSRule against it. Perhaps there is a better approach to what I am doing, but being able to filter on a resource group this large may come in handy in other scenarios.

**Describe alternatives you've considered**

For my specific experimentation, I was able to get templates for the resources that I needed separately. This is not a scalable solution, though.

**Additional context**

I am an application security architect. I am using the aforementioned approach because I would not necessarily know fine-grained details about each resource but could certainly filter on which types I am most concerned about.