API: Support paging in the admin orgs list API (#26932)

* Add page/limit to org search

* Update docs

* Fix test per PR feedback

pkg/services/sqlstore/org_test.go

@@ -35,6 +35,38 @@ func TestAccountDataAccess(t *testing.T) {
 			So(len(query.Result), ShouldEqual, 3)
 		})
 
+		Convey("Given we have organizations, we can limit and paginate search", func() {
+			for i := 1; i < 4; i++ {
+				cmd := &models.CreateOrgCommand{Name: fmt.Sprint("Org #", i)}
+				err := CreateOrg(cmd)
+				So(err, ShouldBeNil)
+			}
+
+			Convey("Should be able to search with defaults", func() {
+				query := &models.SearchOrgsQuery{}
+				err := SearchOrgs(query)
+
+				So(err, ShouldBeNil)
+				So(len(query.Result), ShouldEqual, 3)
+			})
+
+			Convey("Should be able to limit search", func() {
+				query := &models.SearchOrgsQuery{Limit: 1}
+				err := SearchOrgs(query)
+
+				So(err, ShouldBeNil)
+				So(len(query.Result), ShouldEqual, 1)
+			})
+
+			Convey("Should be able to limit and paginate search", func() {
+				query := &models.SearchOrgsQuery{Limit: 2, Page: 1}
+				err := SearchOrgs(query)
+
+				So(err, ShouldBeNil)
+				So(len(query.Result), ShouldEqual, 1)
+			})
+		})
+
 		Convey("Given single org mode", func() {
 			setting.AutoAssignOrg = true
 			setting.AutoAssignOrgId = 1