Rodrigo Friães e211e96d33
Fix nushell#10591: encode returns error with utf-16le and utf-16be encodings (nushell#10591) (#12411)
# Description

This closes (nushell#10591)

The Command encode's help text says that utf-16le and utf-16be encodings
are not supported, however you could still use these encodings and they
didn't work properly, since they returned the bytes UTF-8 encoded:
```bash
"䆺ש" | encode utf-16
Length: 5 (0x5) bytes | printable whitespace ascii_other non_ascii
00000000: e4 86 ba d7 a9 ×××××
 ```
# User-Facing Changes

The Command encode's help text was updated and now when trying to encode with utf-16le and utf-16be returns an error:
![screenshot](https://github.com/nushell/nushell/assets/119532691/c346dc57-8b42-4dfc-93d5-638b0041d89f)

# Tests + Formatting

- 🟢 `toolkit fmt`
- 🟢 `toolkit clippy`
- 🟢 `toolkit test`
- 🟢 `toolkit test stdlib`
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Nushell core libraries and plugins

These sub-crates form both the foundation for Nu and a set of plugins which extend Nu with additional functionality.

Foundational libraries are split into two kinds of crates:

  • Core crates - those crates that work together to build the Nushell language engine
  • Support crates - a set of crates that support the engine with additional features like JSON support, ANSI support, and more.

Plugins are likewise also split into two types:

  • Core plugins - plugins that provide part of the default experience of Nu, including access to the system properties, processes, and web-connectivity features.
  • Extra plugins - these plugins run a wide range of different capabilities like working with different file types, charting, viewing binary data, and more.