feat: add Tilt support for local development

[joekr]

What this PR does / why we need it:
This will allow for more rapid development as tilt supports
hot reload on code changes.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
No open issues currently

[joekr]

I need to create a doc somewhere temporarily to explain a bit how to work with Tilt. Once we have an official development guild all this will be moved in as well.

cat <<EOF > tilt-settings.json
{
  "kustomize_substitutions": {
      "OCI_TENANCY_ID_B64": "$(echo "${OCI_TENANCY_ID}" | tr -d '\n' | base64 | tr -d '\n')",
      "OCI_CREDENTIALS_FINGERPRINT_B64": "$(echo "${OCI_CREDENTIALS_FINGERPRINT}" | tr -d '\n' | base64 | tr -d '\n')",
      "OCI_USER_ID_B64": "$(echo "${OCI_USER_ID}" | tr -d '\n' | base64 | tr -d '\n')",
      "OCI_REGION_B64": "$(echo "${OCI_REGION}" | tr -d '\n' | base64 | tr -d '\n')",
      "OCI_CREDENTIALS_KEY_B64": "$(echo "${OCI_CREDENTIALS_KEY_PATH}" | tr -d '\n' | base64 | tr -d '\n')"
  }
}
EOF

UPDATE
I've added a local-dev.md doc as a temporary "HOW TO" doc while we work on the actual book's development page.

[joekr]

unit tests

?       github.com/oracle/cluster-api-provider-oci      [no test files]
ok      github.com/oracle/cluster-api-provider-oci/api/v1beta1  0.251s  coverage: 18.7% of statements
?       github.com/oracle/cluster-api-provider-oci/cloud/config [no test files]
ok      github.com/oracle/cluster-api-provider-oci/cloud/ociutil        0.208s  coverage: 25.0% of statements
ok      github.com/oracle/cluster-api-provider-oci/cloud/scope  176.020s        coverage: 73.4% of statements
?       github.com/oracle/cluster-api-provider-oci/cloud/scope/mocks    [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/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/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/controllers  26.255s coverage: 71.0% of statements
?       github.com/oracle/cluster-api-provider-oci/exp/api/v1beta1      [no test files]
?       github.com/oracle/cluster-api-provider-oci/exp/controllers      [no test files]
?       github.com/oracle/cluster-api-provider-oci/feature      [no test files]

e2e tests

Ran 5 of 22 Specs in 1975.032 seconds
SUCCESS! -- 5 Passed | 0 Failed | 0 Pending | 17 Skipped


Ginkgo ran 1 suite in 33m47.333217601s
Test Suite Passed

[arindam-bandyopadhyay]

LGTM