Add image lookup

[shyamradhakrishnan]

What this PR does / why we need it: Add ability to lookup images.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #280

[shyamradhakrishnan]

unit test

KUBEBUILDER_ASSETS="/home/ubuntu/.local/share/kubebuilder-envtest/k8s/1.24.2-linux-amd64" go test -coverprofile=coverage.out ./...
?   	github.com/oracle/cluster-api-provider-oci	[no test files]
ok  	github.com/oracle/cluster-api-provider-oci/api/v1beta1	44.324s	coverage: 23.8% of statements
ok  	github.com/oracle/cluster-api-provider-oci/api/v1beta2	0.030s	coverage: 15.6% of statements
?   	github.com/oracle/cluster-api-provider-oci/cloud/config	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/cloud/metrics	[no test files]
ok  	github.com/oracle/cluster-api-provider-oci/cloud/ociutil	0.011s	coverage: 19.6% of statements
ok  	github.com/oracle/cluster-api-provider-oci/cloud/scope	243.051s	coverage: 75.7% of statements
?   	github.com/oracle/cluster-api-provider-oci/cloud/scope/mocks	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/cloud/services/base	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/cloud/services/base/mock_base	[no test files]
?   	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	[no test files]
?   	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	[no test files]
?   	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	[no test files]
?   	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	[no test files]
?   	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	[no test files]
?   	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	[no test files]
?   	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	[no test files]
ok  	github.com/oracle/cluster-api-provider-oci/cloud/util	0.274s	coverage: 76.1% of statements
ok  	github.com/oracle/cluster-api-provider-oci/controllers	26.003s	coverage: 67.5% of statements
ok  	github.com/oracle/cluster-api-provider-oci/exp/api/v1beta1	30.715s	coverage: 18.6% of statements
ok  	github.com/oracle/cluster-api-provider-oci/exp/api/v1beta2	0.026s	coverage: 9.5% of statements
ok  	github.com/oracle/cluster-api-provider-oci/exp/controllers	1.188s	coverage: 56.7% of statements
?   	github.com/oracle/cluster-api-provider-oci/feature	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/version	[no test files]
go tool cover -func=coverage.out -o coverage.txt
go tool cover -html=coverage.out -o coverage.html