Implement adding pinned mods

[OST-Gh]

I implemented a primitive version of pinned versions for modrinth and curseforge.

On my machine, some tests have failed. I don't know if it is critical though.

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[cla-bot]

We require contributors to sign our Contributor License Agreement, and we don't have yours on file. In order for us to review and merge your code, please send a signing request to cla-requests@gdlauncher.com and add your github handle to contributors list.

[cla-bot]

We require contributors to sign our Contributor License Agreement, and we don't have yours on file. In order for us to review and merge your code, please send a signing request to cla-requests@gdlauncher.com and add your github handle to contributors list.

[OST-Gh]

tbh, why am i so lazy

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