Configuration - Add VCPKG port opencascade

[dpasukhi]

• Restructures VCPKG manifest directory structure and updates path references accordingly
• Implements a comprehensive portfile.cmake with feature detection, build configuration, and installation logic
• Updates overlay port and triplet paths to reflect the new directory structure

[Copilot]

Pull Request Overview

This PR adds VCPKG port configuration for OpenCASCADE, enabling the project to be packaged and distributed through the VCPKG package manager. The changes establish the necessary port files and update the build configuration to support VCPKG-based builds.

• Adds a complete VCPKG portfile with feature mapping and build configuration
• Updates VCPKG manifest directory path to point to the new port location
• Adjusts overlay paths in VCPKG configuration to maintain proper directory structure

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 3 comments.

File	Description
adm/vcpkg/ports/opencascade/vcpkg-configuration.json	Updates overlay paths to reference parent directories for ports and triplets
adm/vcpkg/ports/opencascade/portfile.cmake	New VCPKG portfile implementing build configuration with feature detection and CMake integration
CMakeLists.txt	Updates VCPKG manifest directory to point to the new OpenCASCADE port location