migrate bgp_instance framework to Plugin Framework

[maksym-nazarenko]

No description provided.

[ddelnano]

One minor comment about the docs change.

Also it looks like this error assertion is different when it's using the plugin framework

terraform-provider-mikrotik/mikrotik/resource_bgp_instance_test.go

Line 57 in d383954

ExpectError: regexp.MustCompile(`Your RouterOS version does not support`),

=== CONT  TestAccMikrotikBgpInstance_createFailsOnRouterOSv7
    resource_bgp_instance_test.go:50: Step 1/1, expected an error with pattern, no match on: Error running apply: exit status 1
        
        Error: Creation failed
        
          with mikrotik_bgp_instance.bar,
          on terraform_plugin_test.tf line 2, in resource "mikrotik_bgp_instance" "bar":
           2: resource "mikrotik_bgp_instance" "bar" {
        
        from RouterOS device: no such command prefix
--- FAIL: TestAccMikrotikBgpInstance_createFailsOnRouterOSv7 (0.46s)

[maksym-nazarenko]

Also it looks like this error assertion is different when it's using the plugin framework

yes, it is not covered by current interface-based implementation of the client (will try to add support for that asap)