Replace download with more in-house implementation.

[Tatsinnit]

Nice @peterbom! We need this because we have a package in use called download which is not updated for last 4 years and this in-house implementation saves us any cross package dependency and future security issues.

Thanks heaps, @peterbom ❤️❤️

[Tatsinnit]

☕️ +1 for this implementation, @peterbom please approve it and we can merge it. (I have tested this and looks awesome)

Best things is we close:

• https://github.com/Azure/vscode-aks-tools/security/dependabot/35
• https://github.com/Azure/vscode-aks-tools/security/dependabot/46
• https://github.com/Azure/vscode-aks-tools/security/dependabot/27

[peterbom]

There is still an outstanding work item for this, #568, but we can address this later.