Add remove command

[amisevsk]

Description

Add kit remove. The modelkit to be removed can either be specified via tag or by digest. If a digest is used, that modelkit is removed from storage (bringing any relevant tags with it). If specified via tag, the model is either untagged or deleted, depending on whether other tags refer to the model. Flag -f|--force can be used to force removal via tag even if other tags point at the modelkit.

Remove a modelkit from local storage.

Description:
  Removes a modelkit from storage on the local disk.

  The model to be removed may be specifed either by a tag or by a digest. If
  specified by digest, that modelkit will be removed along with any tags that
  might refer to it. If specified by tag (and the --force flag is not used),
  the modelkit will only be removed if no other tags refer to it; otherwise
  it is only untagged.

Usage:
  kit remove [flags] <reference>

Examples:
  kit remove my-registry.com/my-org/my-repo:my-tag
  kit remove my-registry.com/my-org/my-repo@sha256:<digest>
  kit remove my-registry.com/my-org/my-repo:tag1,tag2,tag3

Flags:
  -f, --force   remove manifest even if other tags refer to it
  -h, --help    help for remove

Global Flags:
      --config string   Config file (default $HOME/.kitops)
  -v, --verbose         Include additional information in output (default false)

[gorkem]

LGTM