API endpoints for listing IP Pools could use filter parameters

[bnaecker]

Here's the API today for listing IP Pools:

omicron/nexus/external-api/src/lib.rs

Lines 703 to 712 in 83f7f06

	/// List IP pools
	#[endpoint {
	method = GET,
	path = "/v1/system/ip-pools",
	tags = ["system/ip-pools"],
	}]
	async fn ip_pool_list(
	rqctx: RequestContext<Self::Context>,
	query_params: Query<PaginatedByNameOrId>,
	) -> Result<HttpResponseOk<ResultsPage<views::IpPool>>, HttpError>;

That's been fine because all the pools are pretty much fungible. But now we've added an IP version to the pools, and we're also making more distinctions such as whether a pool is delegated for internal Oxide use. We could add these as query parameters to these endpoints to avoid client-side filtering.