support a `path` argument to `amplify plugin add`

### Is this feature request related to a new or existing Amplify category?

New category

### Is this related to another service?

_No response_

### Describe the feature you'd like to request

Support a `path` argument on `amplify plugin add` to simplify command:

`amplify plugin add --path $(pnpm root -g)/amplify-graphql-seed-plugin`

Currently we need to first capture the absolute path, and paste it in to the required prompt

```console
> echo $(pnpm root -g)/amplify-graphql-seed-plugin | pbcopy

> amplify plugin add
? Enter the absolute path for the root of the plugin directory:
/Users/josef/Library/pnpm/global/5/node_modules/amplify-graphql-seed-plugin
Successfully added plugin package.
? Run a fresh scan for plugins on the Amplify CLI pluggable platform Yes
```

### Describe the solution you'd like

see above

### Describe alternatives you've considered

n/a

### Additional context

_No response_

### Is this something that you'd be interested in working on?

- [ ] 👋 I may be able to implement this feature request

### Would this feature include a breaking change?

- [ ] ⚠️ This feature might incur a breaking change

Start at the CLI implementation and argument parsing for `amplify plugin add`; trace how the current interactive absolute-path prompt is reached. Add support for the requested `--path` value and verify that the command can add the plugin without requiring the path prompt.

Written by the indexing model from the issue text.