Log when token renewal is done transparently

[krishnangovindraj]

What is the goal of this PR?

Log when the client transparently renews the authentication token, facilitating debugging.

What are the changes implemented in this PR?

• Add a log line in ClusterServerStub when the client transparently renews the authentication token.

[typedb-bot]

PR Review Checklist

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Trivial Change

• This change is trivial and does not require a code or architecture review.

Code

• Packages, classes, and methods have a single domain of responsibility.
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• The code is canonical and the minimum required to achieve the goal.
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Architecture

• Any required refactoring is completed, and the architecture does not introduce technical debt incidentally.
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