OpenSystemsDevelopment / qpdf

…ges::all` method, add `Pages::size` and `empty` methods, move `getAllPagesInternal` to private section, streamline encapsulation, and enhance code organization.

… to improve code organization.

… streamline error handling, and improve encapsulation.

… improve encapsulation.

…nd improve encapsulation.

…s, and improve encapsulation.

…ctions and improve encapsulation.

…reamline stream registration, and improve encapsulation.

… and streamline stream handling.

… handling, and enhance encapsulation.

…tion, and streamline stream registration logic.

…ta`and streamline foreign stream handling.

…oreign stream handling, and simplify return logic.

…e encapsulation, and streamline foreign stream handling.

…prove encapsulation, and streamline stream data handling.

…e encapsulation, and streamline stream data handling.

…eamline foreign object handling, and simplify method structure.

…`Copier` usage, and simplify object copying logic.

…ne object copying logic, and simplify method structure.

…object reservation, and streamline method usage.

…rect_object`, simplify object replacement, and streamline method usage.

…eamline type-specific handling, and remove redundant test coverage evaluations.

…t usage of `std::shared_ptr`, simplify stream data management, and enforce `final` specifier.

… `StreamDataProvider` management.

Implement default constructor, copy/move constructors, and assignment operators for `Stream`. Add overloads for initializing `Stream` with `QPDFObjectHandle`.

Replace `getParsedOffset()` with the new `offset()` method across `QPDFObjectHandle` and related classes for consistent offset handling. Simplify logic and remove redundant `getParsedOffset()` implementation.

…proved encapsulation.

Encapsulate linearization-related logic in `QPDF::Doc::Linearization`. Refactor methods, relocate implementations, and update all references accordingly to streamline and centralize linearization functionality.

Relocate `Pages` methods to `QPDF::Doc` for improved encapsulation of page-related logic. Adjust all references and methods to use the new placement.

Refactor `pages` method and related members in `QPDF::Doc` to `page_dh`. Update all associated references to reflect the change.

Streamline `setLastObjectDescription` usage by consolidating string construction at call sites. Relocate method to the private section to improve encapsulation and restrict access.

Relocate `Objects` to `QPDF::Doc` for improved encapsulation of object-related logic. Adjust all relevant methods and references to use the new placement.