SDK-88: Add edge_ips, argo_smart_routing support for Spectrum

[patryk]

This PR adds the following to Spectrum Application resource:

• edge_ips - Specifies Edge IPs provisioned with optional Bring Your Own IPs feature
• argo_smart_routing - Enables Argo Smart Routing for Spectrum application (
  TCP only)
• edge_ip_connectivity - Specifies IP address family used for edge DNS record for Spectrum Application (IPv4/6, etc.)

[jacobbednarz]

Looks like this has busted the Import.

------- Stdout: -------
=== RUN   TestAccCloudflareSpectrumApplication_Import
=== PAUSE TestAccCloudflareSpectrumApplication_Import
=== CONT  TestAccCloudflareSpectrumApplication_Import
--- FAIL: TestAccCloudflareSpectrumApplication_Import (4.51s)
    testing.go:654: Step 1 error: ImportStateVerify attributes not equivalent. Difference is shown below. Top is actual, bottom is expected.
        
        (map[string]string) {
        }
        
        
        (map[string]string) (len=1) {
         (string) (len=20) "edge_ip_connectivity": (string) (len=3) "all"
        }
        
FAIL

[patryk]

@jacobbednarz made some small changes to make test happy.

[jacobbednarz]

looks great! 🚢