Add the remaining `Patch` actions to the CLI interface. These include:
- React to a revision
- Edit a comment
- React to a comment
- Redact a comment
The `react` subcommand is added in a straight-forward manner.
The comment commands are slightly less straight-forward. In order to
keep to one layer of subcommands, these variants are done through the
`rad patch comment` subcommand. They are accessed via options:
`--edit`, `--react`, and `--redact`, respectively. Each of these
options takes the `CommentId` for which the action is affecting. The
`message`, `react` (introduced for `rad patch react`), and `undo`
variables repurposed for this subset of actions.
Fintan Halpenny