Feat/streamclient jsdoc

[oscarj007]

This change addresses issue #337 by adding comprehensive JSDoc annotations to the ConduitClient class and its public
methods (constructor, pauseStream, unpauseStream, and setWallet).

Changes:

• Added high-level class documentation with an usage example that demonstrates typical configuration using
  environment variables.
• Added @PARAM, @returns, and @throws tags to all public methods to improve IDE intellisense support.
• Documented error conditions (@throws) for better developer awareness of failure modes.
• Ensured consistent documentation style across the class.

These improvements will significantly enhance the developer experience by providing clear documentation directly
within the editor when consuming the SDK.

closes #337

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@oscarj007 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

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[Jaydbrown]

Thanks for the contribution here — squash-merging this now. Any follow-ups we'll track in a fresh issue. 🚀