Allow to use tryExtensions in the rule no-unpublished-import

[wdzeng]

I just found that the option tryExtensions is available in no-unpublished-require, but not in no-unpublished-import. So I add this option.

Both lib/util/visit-require.js and lib/util/visit-import.js support this option, so this PR should work.

Here is my manual test:

1. Create an empty project.
2. Create package.json at the project root with only one line {"files":["index.mts","foo.mts"]}.
3. Create index.mts at the project root with only one line import foo from './foo'; import bar from './bar';.
4. Install eslint and eslint-plugin-n by npm i -D eslint eslint-plugin-n.
5. Create eslint.config.mjs at the project root.

   import eslintPluginN from 'eslint-plugin-n'
   export default [{
     files: ['*.mts'],
     plugins: { n: eslintPluginN },
     // rules: { 'n/no-unpublished-import': ['error'] }
     rules: { 'n/no-unpublished-import': ['error', { tryExtensions: ['.mts'] }] } 
   }]

6. Run npx eslint index.mts.

Here is the test result:

	Without this PR	With this PR
Use commented rules in step 5.	Got false error message: error "./foo" is not published.	Same as left.
Use uncommented rules in step 5.	Got error message in step 6: Unexpected property "tryExtensions".	Work as expected.

I also tried with using tsconfig.json and path alias. It works smoothly.

[scagood]

Looks good in general, thank you!

Do you think you can add a couple of tests for this option too?

[wdzeng]

Hi @scagood I've done the test. One valid case and one invalid case.

[scagood]

💜 Thank you!

[aladdin-add]

LGTM, thanks! 💯