Implement `archive list` and `archive extract` for web `.data` files

[davschne-unity]

• Add sample .data file for testing

• Add function to determine if a file is a web bundle

• Rename test to disambiguate with forthcoming test

• HandleExtractArchive handles .data files as well as asset bundles

• Propagate specific error message to console output

• Simplify IsWebBundle test to use file extension

Since we also need to support gzip- and brotli-compressed web bundles, and we don't want to decompress more than once.

• Check for invalid web bundle in ParseWebBundleHeader

And throw the appropriate exception type (requires adding package System.IO.Packaging).

• Remove unneeded using statement

• Simplify namespace paths where possible

• Support extracting gzip- and brotli-compressed web bundles

• Clean up using statements

• Extract function to facilitate error handling

• Reading less than the expected number of bytes raises FileFormatException

• Extract function ReadUInt32 to facilitate error handling

• EndOfStream from ReadUInt32 raises FileFormatException

• Rename test to disambiguate with forthcoming test

• Wrap console redirection in try/finally to ensure it's restored

• Whitespace

• Extract function ListAssetBundle

• Test archive list on web bundle (fails)

• Log error message in archive list

• Add function ListWebBundle

• HandleListArchive branches on archive type

• Move members related to archive command to a new file

• Remove redundancy in function names

• Update CLI command descriptions

• Update README description of archive command

• Normalize wording: "content" -> "contents"

• Whitespace

• Add .gitattributes to specify auto line endings