Better error message for invalid directory import

@addaleax

The following test case was brought up by @addaleax

esm.mjs:

import mod from './';

console.log(mod);

where node esm.mjs fails with

TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension "" for /tmp/test/
    at Loader.defaultGetFormat [as _getFormat] (internal/modules/esm/get_format.js:65:15)

We should ensure the error message here provides the correct steps to resolve the issue.

esm: improve commonjs hint on module not found

module: add specific error for dir import

esm: improve commonjs hint on module not found

module: add specific error for dir import

esm: improve commonjs hint on module not found

module: add specific error for dir import

esm: improve commonjs hint on module not found

module: add specific error for dir import

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Better error message for invalid directory import #33219

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Better error message for invalid directory import #33219

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