Enh Req - Support filter over Annotations from image metadata

**What is the problem you're trying to solve**
Docker images inside their metadata may have `Annotations` filled with key/value pairs. At the moment there is not possible to filter/select only those images, which has specific key=value inside Annotations present.

**Describe the solution you'd like**
Would like to have extra option like `--annotations key=value`, so filtering could work on that.

**Additional context**
Such functionality will be of importance while using `acr purge` command