Dev extensions

[research11111]

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[welcome]

Thanks for opening this pull request! Please check out our contributing guidelines and check for the automated tests.

[cryos]

This doesn't make sense and is not the direction we want to move the CMake code in this project. We use components, target level properties.

[research11111]

mistake i remove

[research11111]

This pull request addresses Issue #1391 and includes the following enhancements:

• Sets the Python path similarly to how the quantumInput extension does.
• Partial support for virtualenv; manual path input is required from the user.
• Enables the addition of custom plugin URLs (GitHub-hosted only).
• Allows local download of the plugins.json file and the ability to add entries to it.
• Supports installations both with and without Conda.
• Features auto-detection of existing installations.
• Automates the installation of dependencies, either from requirements.txt or pyproject.toml (https://github.com/research11111/avogadro-rdkit/ may be used to validate).

[research11111]

add CMakeFile