For instance,
```
echo 'abcdefghijklmnopqrstuvwxyz' | hash sha256 --binary
```
Will returns the hash as a binary value instead of a hexadecimaly encoded string.
* feat: deprecate `hash base64` command
* feat: extend `decode` and `encode` command families
This commit
- Adds `encode` command family
- Backports `hash base64` features to `encode base64` and `decode base64` subcommands.
- Refactors code a bit and extends tests for encodings
- `decode base64` returns a binary `Value` (that may be decoded into a string using `decode` command)
* feat: add `--binary(-b)` flag to `decode base64`
Default output type is now string, but binary can be requested using this new flag.
* Ignore `cargo tarpaulin` output files
* Add expected result for `columns` example
Examples without provided expected output will never be tested.
The subset of commands available in `test_examples()` is limited thus
excluding the tests depending on other commands
* Add example test harness to `reject`
* Test and fix `wrap` example
* Test and fix `drop column` example
* Update `from ods` examples
* Update `from xlsx` examples
* Run `to nuon` examples
* Run `hash base64` examples
* Add example output to `path parse`
* Test and fix the `grid` examples
