Add .js extension for artifacts import (ESM compatability)

[gilgardosh]

Issue workflow progress

Progress of the issue based on the
Contributor Workflow

• 1. The issue provides a reproduction available on
  Github,
  Stackblitz
  or
  CodeSandbox

Make sure to fork this template and run yarn generate in the terminal.

Please make sure Mesh package versions under package.json matches yours.

• 2. A failing test has been provided
• 3. A local solution has been provided
• 4. A pull request is pending review

---

Describe the bug

Bundling a package with Mesh artifacts as ESM results in error, since the hardcoded paths in the artifacts are missing .js extension

To Reproduce Steps to reproduce the behavior:

1. Create a basic Mesh example with local sources (e.g the json-schema-example)
2. Generate artifact
3. Create ESM bundle
4. Try to run the bundled artifact

Expected behavior

Bundled artifacts should fully support ESM

[gilgardosh]

ESM is currently supported. with the NODE_OPTIONS=\"--loader ts-node/esm\" mesh build command.
@ardatan can we maybe migrate this var to the configuration file?