perf: optimized the javadoc from binary and filter common 3rd lib

[wenytang-ms]

1. skip binary jar (may always 3rd lib) java doc
2. skip more common libs import content

[Copilot]

Pull Request Overview

This PR optimizes JavaDoc extraction performance by skipping expensive operations for binary types and expands the list of common well-known library packages to reduce unnecessary processing for external dependencies that Copilot already understands.

• Adds early return in extractRelevantJavaDocContent to skip expensive JavaDoc extraction for binary types (JAR files)
• Expands SKIP_COMMON_JDK_PACKAGES to include 50+ well-known libraries (Spring, Jakarta EE, testing frameworks, logging, Jackson, Guava, Apache Commons, etc.)
• Removes redundant binary type handling logic that involved costly operations like JAR I/O, network downloads, and HTML parsing

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