Add an ASCII hex dump feature

[davidva-ecco]

The "hexdump for VSCode" extension (vscode-hexdump) was deprecated in the VSCode marketplace in favor of Hex Editor. However, Hex Editor does not have a true "hex dump" function that dumps the decoded hex data as ASCII text that can be edited/copy-pasted to another editor/reformatted.

I do not have the JavaScript or TypeScript skills needed to create a PR, so I would like to request an ASCII hex dump feature get added to Hex Editor, if the community feels it is the correct extension for it. I originally requested the hexdump extension to be un-deprecated and it was suggested I put a feature request in here instead. Here's a link to my original issue, there are a couple comments in there from other users that may be of use: stef-levesque/vscode-hexdump#86

Thank you!