v3: Migrate eTag functinoality from the VSCE to these APIs

[zFernand0]

Is your feature or enhancement request related to a problem or limitation? Please describe

See title 😋

Describe your enhancement idea

Move the checksum calculation to the plug-in to remove the need of crypto on the VSCE

Describe alternatives you've considered

N/A

Provide any additional context

https://github.com/zowe/zowe-explorer-vscode/blob/next/packages/zowe-explorer-ftp-extension/src/ZoweExplorerFtpUssApi.ts#L300

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