telemetry attributes not sent on token exchange request

Checklist

• I have looked into the README and have not found a suitable solution or answer.
• I have looked into the documentation and have not found a suitable solution or answer.
• I have searched the issues and have not found a suitable solution or answer.
• I have upgraded to the latest version of OpenFGA and the issue still persists.
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Description

When recording the counter for the credentials request, no attributes are sent.

Notice the empty attributes map sent on to record the metric: https://github.com/openfga/java-sdk/blob/main/src/main/java/dev/openfga/sdk/api/auth/OAuth2Client.java#L69

Attributes are created in HttpRequestAttempt, but they are not sent back to exchangeToken() and included in the call to record the counter.

Expectation

Any configured attributes, or the default attributes if not configured, should be sent with the credentials request.

Reproduction

Given the default telemetry configuration
When a credentials exchange request is executed
No attributes are sent with the fga-client.credentials.request counter metric

OpenFGA SDK version

0.8.0

OpenFGA version

any

SDK Configuration

no config

Logs

No response

References

No response

Start in src/main/java/dev/openfga/sdk/api/auth/OAuth2Client.java around line 69, then trace how HttpRequestAttempt creates attributes and how exchangeToken() records the counter. Verify the credentials request with the default telemetry configuration and confirm that configured or default attributes reach the fga-client.credentials.request metric.