Add proxy configuration for internal Invoke-WebRequest

[jaslawinMs]

Issue

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• [v] Version of PowerShell you're using 7.1.4
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• [v] Operating system you're running Windows 11
• [v] Version of CosmosDB PowerShell Module you're using (use Get-Module -Name CosmosDB) 2.1.6.561

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Hi, thx for the module! My environment is a secure one and outgoing communication must have proxy setup. I would like to ask you to add extra configuration that goes to Invoke-WebRequest: -Proxy -ProxyUseDefaultCredentials -NoProxy

I would be happy to add it as well but I feel this proxy configuration may need some design decision first.