Support more configs for cluster and VCN creation

[zihuaweng]

What would you like to be added:

1. Support the following config in OCIManagedControlPlaneSpec:
   

   cluster-api-provider-oci/api/v1beta2/ocimanagedcontrolplane_types.go

   Line 147 in b53ef08

   type KubernetesNetworkConfig struct {

   
   Additional options:
   serviceLbSubnetIds
   https://docs.oracle.com/en-us/iaas/api/#/en/containerengine/20180222/datatypes/ClusterCreateOptions
   

   cluster-api-provider-oci/api/v1beta2/ocimanagedcontrolplane_types.go

   Line 88 in b53ef08

   type EndpointConfig struct {

   
   Additional options:
   subnetId
   https://docs.oracle.com/en-us/iaas/api/#/en/containerengine/20180222/datatypes/CreateClusterEndpointConfigDetails

2. Support for prohibitPublicIpOnVnic
   https://docs.oracle.com/en-us/iaas/api/#/en/iaas/20160918/datatypes/CreateSubnetDetails

3. Add support for customized route table:
   https://docs.oracle.com/en-us/iaas/api/#/en/iaas/20160918/datatypes/CreateRouteTableDetails
   Currently we can only choose to skip or not skip route tables
   

   cluster-api-provider-oci/api/v1beta2/types.go

   Line 1090 in b53ef08

   // RouteTable is used to specify the options for creating Route table.

4. Add support for Dynamic Routing Gateways
   https://docs.oracle.com/en-us/iaas/Content/Network/Tasks/managingDRGs.htm

Why is this needed:
We would like to automate networking and cluster setup using CAPOCI. These features are required for our networking and cluster setup

[zihuaweng]

Update:
For No.1 We are able to achieve this by adding the role parameter to the lb subnet and control-plane-endpoint subnet https://github.com/oracle/cluster-api-provider-oci/blob/main/api/v1beta2/types.go#L34

For No.2 We are able to set prohibitPublicIpOnVnic by setting the type of subnet https://github.com/oracle/cluster-api-provider-oci/blob/main/api/v1beta2/types.go#L858

For No.4: There is existing support to add DRG