Add JSDoc documentation for IStartFuncProcessResult stream property

[Copilot]

Addresses feedback to document the stream property in the return type of startFuncProcessFromApi, which lacked explanation of its purpose and usage.

Changes

• Extracted inline return type into IStartFuncProcessResult interface
• Added JSDoc documentation for the stream property explaining:
  • Provides real-time terminal output from func host start command
  • Returns undefined if host fails to start or streaming unavailable
  • Remains active for the lifetime of the function host process
  • Should be consumed via async iteration

/**
 * An async iterable stream of terminal output from the function host task.
 * This stream provides real-time access to the output of the `func host start` command,
 * allowing consumers to monitor host status, capture logs, and detect errors.
 * 
 * The stream will be undefined if the host failed to start or if output streaming is not available.
 * Consumers should iterate over the stream asynchronously to read output lines as they are produced.
 * The stream remains active for the lifetime of the function host process.
 */
stream: AsyncIterable<string> | undefined;

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