Add `foundryup` support for Windows

[akshatmittal]

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• [x] Because this PR includes a bug fix, relevant tests have been included.
• [ ] Because this PR includes a new feature, the change was previously discussed on an Issue or with someone from the team.
• [ ] I didn't do anything of this.

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This PR adds support for foundryup on Windows, especially if forge is not available in path or conflicts with other globally installed packages.

[codecov-commenter]

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[Xanewok]

@kanej Do you think this fix looks acceptable? I don't have a Windows box but I imagine that installing through

curl -L https://foundry.paradigm.xyz | bash.

Now installs to .foundry rather than .cargo, so this makes sense, I think.