* chore: updated samples/package.json [ci skip]

* chore: updated CHANGELOG.md [ci skip]

* chore: updated package.json

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* chore: updated samples/package.json [ci skip]

* chore: updated CHANGELOG.md [ci skip]

* chore: updated package.json

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

This will subclass the abstract class `BaseExternalAccountClient` and will retrieve subject tokens from URLs (eg Azure Instance Metadata Service) or a file location (K8s KSA tokens).

Renamed `ExternalAccountClient` to `BaseExternalAccountClient`. The latter will not be exported. Instead the former will be created as an empty class with a static `fromJSON()` method to initialize the right type of external client.

…misify(fs.readFile)`.