ODJ-3077 integrate IAAS API (#203)

* Introduces Support fo IaaS API of STACKIT to support everything network related and as a basis for the community Terraform provider.

.gitignore

@@ -0,0 +1 @@
+.idea/

examples/iaas/iaas.go

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+package main
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/SchwarzIT/community-stackit-go-client/pkg/validate"
+	"github.com/google/uuid"
+
+	stackit "github.com/SchwarzIT/community-stackit-go-client"
+	iaas "github.com/SchwarzIT/community-stackit-go-client/pkg/services/iaas-api/v1alpha"
+)
+
+func main() {
+	ctx := context.Background()
+	c := stackit.MustNewClientWithKeyAuth(ctx)
+
+	l := 25
+
+	servers := []iaas.V1IP{
+		"8.8.8.8",
+	}
+
+	req := iaas.V1CreateNetworkJSONBody{
+		// Name The name for a General Object. Matches Names and also UUIDs.
+		Name: "Network",
+
+		// Nameservers List of DNS Servers/Nameservers.
+		Nameservers:    &servers, //
+		PrefixLengthV4: &l,
+	}
+	projectID := uuid.New()
+
+	res, err := c.IAAS.V1CreateNetwork(ctx, projectID, iaas.V1CreateNetworkJSONRequestBody(req))
+	if err = validate.Response(res, err, "JSON200.AvailabilityZones"); err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	fmt.Println(res.JSON202.RequestID)
+}