[chore] Add `Surcharge` model · EasyPost/easypost-csharp@4e80e4b

The following actions uses Node.js version which is deprecated and will be forced to run on node20: actions/setup-dotnet@v3. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

'TimeInTransitDetails' is obsolete: 'This class will be removed in a future version and replaced with TimeInTransitDetailsForDeliveryDateEstimate.'

'TimeInTransitDetails' is obsolete: 'This class will be removed in a future version and replaced with TimeInTransitDetailsForDeliveryDateEstimate.'

Missing XML comment for publicly visible type or member 'Options.CarrierInsuranceAmount'

Missing XML comment for publicly visible type or member 'Options.CommercialInvoiceFormat'

Missing XML comment for publicly visible type or member 'Options.CommercialInvoiceLetterhead'

Missing XML comment for publicly visible type or member 'Options.CommercialInvoiceSignature'

Missing XML comment for publicly visible type or member 'Options.CommercialInvoiceSize'

Missing XML comment for publicly visible type or member 'Options.CostCenter'

Missing XML comment for publicly visible type or member 'Options.CustomsBrokerAddressId'

Missing XML comment for publicly visible type or member 'Options.CustomsIncludeShipping'

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