Use Case

As a developer
I want to avoid downloading `@mongodb-js/zstd` and use built-in zstd implementation from `zlib` (that was introduced in node 22.15.0)
So that there are less dependencies and less security concerns about binary files in dependencies and it's easier to enable without rebuilding the application

User Experience

• zstd can be used without fetching `@mongodb-js/zstd`
• `@mongodb-js/zstd` can still be used on legacy environments

Risks/Unknowns

• Developers could use zstd compression on environments with modern nodejs and then it won't run via older nodejs
• node 20 already reached EOL

Acceptance Criteria

Implementation Requirements

• there should be no difference between running built-in ztsd or `@mongodb-js/zstd`

Documentation Requirements

• every mention of `@mongodb-js/zstd` in docs should be updated, to indicate that it's optional