fix: instrument ESM package export submodule

[isaacs]

Add support for patching an ESM internal module that is exported with a submodule path name in the package.json exports object.

Which problem is this PR solving?

It is not currently possible to patch an ESM submodule export.

Fixes # (issue)

Short description of the changes

When determining whether to apply a patch, the file.name is compared against the normalizedPath. However, this makes it impossible to get import-in-the-middle to consider the module a valid hook target.

Allow passing in the submodule specifier as the file name, treating it as the effective "path" to be hooked.

This is the continuation (one level higher in the stack) of nodejs/import-in-the-middle#215

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update (maybe?)

I believe it could be argued that this is a new feature, and perhaps even not the most elegant approach. It does feel a bit clunky, tbh, since the "filename" being passed in is actually a virtual path defined in package.json, not an actual path on disk, since those are fully abstracted away by the ESM module loading semantics. But, I can't see how it would break any existing use cases.

How Has This Been Tested?

Test included in the patch, at experimental/packages/opentelemetry-instrumentation/test/node/EsmSubmoduleInstrumentation.test.mjs

Checklist:

• Followed the style guidelines of this project
• Unit tests have been added
• Documentation has been updated

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[isaacs]

ping @open-telemetry/javascript-approvers

Any guidance would be much appreciated, if this isn't the best way to get this done, but it's blocking the instrumenting of certain package submodule exports in ESM mode.