[vcpkg] Correctly record default feature list in BinaryParagraphs. Fixes #10678.

[ras0219-msft]

When determining the precise list of features requested by a particular package reference (FullPackageSpec in the code), the resolution algorithm must sometimes consult the list of default dependencies for the already installed package. This is because a reference such as cpprestsdk[compression] refers to the union of cpprestsdk's declared default features and the compression feature. In the case of depending upon an already installed package, we resolve defaults to the installed package's list until that package has been determined to need rebuilding.

Unfortunately, we were silently not recording the list of defaults for packages, which caused all references to default features in already installed packages to misbehave and not actually require any features.

• What does your PR fix?

Fixes an underlying bug discovered in issue #10678. Users will need to rebuild all packages with default features to fully fix the problem. Requires also merging #11082 for a full resolution of @Ghabry's issue.

• Which triplets are supported/not supported? Have you updated the CI baseline?

N/A

• Does your PR follow the maintainer guide?

Yes