fix(tools/looker): Looker client OAuth nil pointer error

[duwenxin99]

The original implementation initializes auth session using direct struct creation &rtl.AuthSession which does not have a source field initialized, causing nil pointer error when the sdk is trying to access this source field. This is fixed by using theNewAuthSession() constructor which automatically initializes a source field.
Fix: #2230

[gemini-code-assist]

Summary of Changes

Hello @duwenxin99, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical bug related to Looker client OAuth, where an uninitialized source field in the authentication session was causing a nil error. The change ensures that the OAuth token is correctly passed and utilized, allowing the Looker SDK to properly authenticate and operate when client OAuth is enabled, thereby fixing the reported issue.

Highlights

• Looker Client OAuth Fix: Resolved a nil error that occurred when using Looker client OAuth by ensuring the source field within the rtl.AuthSession is properly initialized with an oauth2.StaticTokenSource.
• Authentication Session Initialization: Explicitly set the source for the AuthSession to use the provided accessToken, preventing a runtime error during SDK creation.

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[gemini-code-assist]

Code Review

This pull request aims to fix a nil error related to Looker client OAuth. However, the proposed change introduces a compilation error by attempting to set an unexported field on a struct from an external package, and it also misses the required import. My review includes a critical comment explaining why the change is invalid and suggests investigating a dependency update as a more robust solution.