Release notes for 0.99.0 (#1566)

* Release notes for `0.99.0`

Please add your new features and breaking changes to the release notes
by opening PRs against the `release-notes-0.99.0` 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))

* std-lib breaking changes (#1578)

* std-lib breaking changes

* small typo

* Added changes to release notes due to nushell/#14020 (#1583)

* Start 0.99.0 release notes (#1586)

* hall of fame

* added full change log

* removed bump version change

* Finish 0.99.0 release notes (#1588)

* Fix typos

* Finish last PRs.

* TOC and excerpt

* Only Nushell changes

* Fix typo

* just add note about no plugin changes

---------

Co-authored-by: Douglas <[email protected]>
Co-authored-by: JustForFun88 <[email protected]>
Co-authored-by: Jack Wright <[email protected]>
Co-authored-by: Devyn Cairns <[email protected]>

Author: 5 people