Release notes for 0.93.0 (#1357)

* Release notes for `0.93.0`

Please add your new features and breaking changes to the release notes
by opening PRs against the `release-notes-0.93.0` branch.

## TODO
- [ ] look at interesting contributions
- [ ] write all the sections
- [ ] order the sections by interest
- [ ] add the breaking changes
- [ ] detail the breaking changes
- [ ] add the full changelog
- [ ] complete all the `TODO`s inside the release note
- [ ] ... (PRs that need to land before the release, e.g. [deprecations](https://github.com/nushell/nushell/labels/deprecation) or [removals](https://github.com/nushell/nushell/pulls?q=is%3Apr+is%3Aopen+label%3Aremoval-after-deprecation))

* Start 0.93.0 release notes

* Fix typo

* Add `last` migration example

* Wording

* Stefan's env tweaks

* Section on stricter env rules

* Release notes for @devyn for 0.93.0 (#1368)

* wip release notes for @devyn 0.93.0

* plugin cache file ⇒ plugin registry file

* add release notes for msgpack commands

* Edit `0.93.0` release notes  (#1373)

* Edit release notes

* Add bug fix table

* Add documentation table

* Escape type

* Release notes for Polars plugin and dataframes deprecation. (#1374)

* "polars/dataframes release notes"

* "polars/dataframes release notes"

* "polars/dataframes release notes"

* "added a space under dataframes section"

* Nearly finish 0.93.0 release notes (#1375)

* Edit input/output type example

* Reorder sections

* Edit release notes

* Add excerpt

* Add full changelog

* Fix typo

* Escape type angle brackets

* Add deprecation warnings

---------

Co-authored-by: sholderbach <[email protected]>
Co-authored-by: Devyn Cairns <[email protected]>
Co-authored-by: Jack Wright <[email protected]>

Author: 4 people