fix: Fix usages of ClientConfig#polling

[fjuma]

Description

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Fixes #294 🦕

[gemini-code-assist]

Summary of Changes

Hello @fjuma, 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 resolves a logical error in the Client class where the isPolling() method from ClientConfig was incorrectly used to set the blocking parameter for MessageSendConfiguration. The fix inverts this logic, ensuring that message sending operations correctly reflect whether the client is configured for polling (non-blocking) or direct blocking, thereby aligning with the intended behavior and resolving a reported issue.

Highlights

• Logic Correction: The logic for determining the blocking state of message sending has been corrected by inverting the value returned by clientConfig.isPolling().
• Issue Resolution: This change addresses and fixes the issue reported in ClientConfig.polling usage #294, ensuring proper message handling based on client configuration.

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[gemini-code-assist]

Code Review

This pull request correctly fixes a logical bug where the ClientConfig#polling setting was being incorrectly used for the MessageSendConfiguration#blocking property. The change correctly inverts the boolean value, as polling and blocking are semantically opposite. This fix is applied consistently in two places within the Client.java file. While the fix is correct, I've identified some code duplication in the modified sections and have suggested a refactoring to improve maintainability.