feat(list): add -c, --docs, and --action flags

[DavertMik]

Summary

• codeceptjs list now accepts -c, --config <file>, mirroring run's flag — useful when multiple configs exist (e.g. list -c test/acceptance/codecept.Playwright.js).
• --docs prints the helper JSDoc beneath each action, with {{> name }} markers resolved against docs/webapi/*.mustache so the rendered prose matches the website docs.
• --action <name> filters to a single action; the I. prefix is optional and --docs is implied.
• JSDoc extraction uses acorn (already a runtime dep, see lib/parser.js) — each `Block` comment is paired with the next `MethodDefinition` from the AST, no regex on JS source.

Example

```sh
$ codeceptjs list --action I.click -c test/acceptance/codecept.Playwright.js
Playwright I.click(locator='//body', context=null, options={})
Perform a click on a link or a button, given by a locator.
...
@param {LocatorOrString} [locator='//body'] (optional, '//body' by default) ...
```

Test plan

• `npx mocha test/runner/list_test.js` — 6 passing (baseline, `-c`, `--docs`, `--action `, `--action I.`, unknown-action message)
• Manual: `list --docs -c test/acceptance/codecept.Playwright.js` — `I.click` shows the resolved `docs/webapi/click.mustache` content + `@param` lines; `grabCheckedElementStatus` (no mustache placeholder) shows pure JSDoc
• Manual: same against `codecept.Puppeteer.js` — second helper renders correctly
• Manual: `list -c /does/not/exist` errors via the same path `run` does

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