Antoine Stevan 1662e61ecb
deprecate def-env and export def-env (#10715)
follow-up to
- https://github.com/nushell/nushell/pull/10566

# Description
this PR deprecates the use of `def-env` and `export def-env`

these two core commands will be removed in 0.88

# User-Facing Changes
using `def-env` will give a warning
```nushell
> def-env foo [] { print "foo" }; foo
Error:   × Deprecated command
   ╭─[entry #1:1:1]
 1 │ def-env foo [] { print "foo" }; foo
   · ───┬───
   ·    ╰── `def-env` is deprecated and will be removed in 0.88.
   ╰────
  help: Use `def --env` instead


foo
```

# Tests + Formatting

# After Submitting
2023-10-19 13:50:16 +08:00
..
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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.