OIDC feature

[dranicu]

What this PR does / why we need it:|
This feature adds the newly announced OIDC configuration into the cluster api. This allows users to provision OKE clusters with the correct OIDC settings in one go.

Which issue(s) this PR fixes:
Fixes #391

Note: Due to the nested structs - I followed conventions in other cluster-api operators and imported go-cmp to better evaluate the differences due to the issues with deepequal

[dranicu]

Unit tests:

github.com/oracle/cluster-api-provider-oci coverage: 0.0% of statements ok github.com/oracle/cluster-api-provider-oci/api/v1beta1 42.490s coverage: 23.3% of statements github.com/oracle/cluster-api-provider-oci/cloud/config coverage: 0.0% of statements github.com/oracle/cluster-api-provider-oci/cloud/metrics coverage: 0.0% of statements ok github.com/oracle/cluster-api-provider-oci/api/v1beta2 0.038s coverage: 14.2% of statements ok github.com/oracle/cluster-api-provider-oci/cloud/ociutil 0.020s coverage: 15.9% of statements github.com/oracle/cluster-api-provider-oci/cloud/scope/mocks coverage: 0.0% of statements github.com/oracle/cluster-api-provider-oci/cloud/services/base coverage: 0.0% of statements github.com/oracle/cluster-api-provider-oci/cloud/services/base/mock_base coverage: 0.0% of statements ? github.com/oracle/cluster-api-provider-oci/cloud/services/compute [no test files] github.com/oracle/cluster-api-provider-oci/cloud/services/compute/mock_compute coverage: 0.0% of statements ? github.com/oracle/cluster-api-provider-oci/cloud/services/computemanagement [no test files] github.com/oracle/cluster-api-provider-oci/cloud/services/computemanagement/mock_computemanagement coverage: 0.0% of statements ? github.com/oracle/cluster-api-provider-oci/cloud/services/containerengine [no test files] github.com/oracle/cluster-api-provider-oci/cloud/services/containerengine/mock_containerengine coverage: 0.0% of statements ? github.com/oracle/cluster-api-provider-oci/cloud/services/identity [no test files] github.com/oracle/cluster-api-provider-oci/cloud/services/identity/mock_identity coverage: 0.0% of statements ? github.com/oracle/cluster-api-provider-oci/cloud/services/loadbalancer [no test files] github.com/oracle/cluster-api-provider-oci/cloud/services/loadbalancer/mock_lb coverage: 0.0% of statements ? github.com/oracle/cluster-api-provider-oci/cloud/services/networkloadbalancer [no test files] github.com/oracle/cluster-api-provider-oci/cloud/services/networkloadbalancer/mock_nlb coverage: 0.0% of statements ? github.com/oracle/cluster-api-provider-oci/cloud/services/vcn [no test files] github.com/oracle/cluster-api-provider-oci/cloud/services/vcn/mock_vcn coverage: 0.0% of statements ? github.com/oracle/cluster-api-provider-oci/cloud/services/workrequests [no test files] github.com/oracle/cluster-api-provider-oci/cloud/services/workrequests/mock_workrequests coverage: 0.0% of statements ok github.com/oracle/cluster-api-provider-oci/cloud/scope 20.218s coverage: 74.5% of statements ok github.com/oracle/cluster-api-provider-oci/cloud/util 0.142s coverage: 61.1% of statements ok github.com/oracle/cluster-api-provider-oci/controllers 1.881s coverage: 59.2% of statements ok github.com/oracle/cluster-api-provider-oci/exp/api/v1beta1 12.248s coverage: 15.3% of statements ok github.com/oracle/cluster-api-provider-oci/exp/api/v1beta2 0.036s coverage: 4.8% of statements github.com/oracle/cluster-api-provider-oci/feature coverage: 0.0% of statements ? github.com/oracle/cluster-api-provider-oci/version [no test files] ok github.com/oracle/cluster-api-provider-oci/exp/controllers 0.506s coverage: 56.3% of statements go tool cover -func=coverage.out -o coverage.txt go tool cover -html=coverage.out -o coverage.html

E2E Tests:

Ran 9 of 31 Specs in 3651.869 seconds SUCCESS! -- 9 Passed | 0 Failed | 0 Pending | 22 Skipped

[joekr]

Thoughts on adding some quick unit tests around this new function?

[joekr]

I don't fully understand this one. What is going on here?