Include VDS changes in CHANGELOG

[mattjala]

• Link from Executive Summary bullet points related to shared strings to the description of the new file format for them
• Add CHANGELOG section for the delayed VDS layout copy

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Important

Update CHANGELOG.md to include VDS performance enhancements and optimizations, with links and a new section on delayed layout copy.

• CHANGELOG Updates:
  • Added links in CHANGELOG.md for faster opening and closing of virtual datasets to specific sections: layoutcopydelay and fileformat.
  • Added a new section in CHANGELOG.md for optimized VDS opens by delaying layout copy, reducing overhead during open operations.

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