fix(pack-api): correctly calculate module size in webpack stats

[xusd320]

Directly read on VitualFileSystem will cause panic.

[gemini-code-assist]

Summary of Changes

Hello @xusd320, 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 bug in the pack-api component where the reported module size in webpack statistics was inaccurate. The changes ensure that module sizes are now correctly calculated by inspecting the actual file content, providing more reliable data for build analysis and optimization.

Highlights

• Module Size Calculation Fix: Corrected the logic for calculating module sizes within webpack stats to ensure accuracy. Previously, the size was incorrectly derived, leading to potentially misleading statistics.
• Content-Based Size Determination: The module size is now accurately determined by reading the actual content length of the file, rather than an erroneous method that did not reflect the true size.

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[gemini-code-assist]

Code Review

This pull request addresses a bug in the calculation of module sizes for webpack stats. The previous implementation was not robust and could lead to errors when reading file content. The new implementation correctly calculates the module size as an Option<u64>, gracefully handling potential read errors or cases where content is not available by setting the size to None. This change improves the resilience of the webpack stats generation. The fix is well-implemented using idiomatic Rust.