add support for ignoring redeploy on image updates

[alehostert]

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Description

Sometimes we don't want terraform to redeploy the instance when a new image got added to data.oci_core_images.

So, it will be great if the module support some lifecycle instruction with ignore_changes as we can do to several resources.

Yeah, I know I can hardcode the image ocid in this example, but, hardcoding things is not terraforming, right? Specially if #78 got implemented.

New or Affected Resource(s)

module "instance" {
  source = "oracle-terraform-modules/compute-instance/oci"

Potential Terraform Configuration

# Copy-paste any Terraform configurations for how the requested feature may be used.
module "instance" {
  source  = "oracle-terraform-modules/compute-instance/oci"
  version = "2.4.1"
  ...

  lifecycle {
    ignore_changes = all
  }
}

References

#78