Release zarr-metadata 0.3.0

Widen ChunksLike type alias (zarr-developers#3990)

* Widen ChunksLike type alias

Fixes zarr-developers#3869

* Add changelog file.

* Prefer if/else statement to if/else expression

release : 3.2.1 release notes (zarr-developers#3942)

* release:3.2.1 release notes

* docs: add changelog entry

* docs: remove changelog

* Fix date and add link

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Co-authored-by: Max Jones <14077947+maxrjones@users.noreply.github.com>

docs: build 3.2.0 release notes (zarr-developers#3932)

* docs: build release notes

* docs: fix release notes

* fix: whitespace

docs: build 3.2.0 release notes (zarr-developers#3932)

* docs: build release notes

* docs: fix release notes

* fix: whitespace

chore/3.1.6 release notes (zarr-developers#3790)

* have towncrier use h2 header for each release note

* remove h1 headers

* release notes

* rebuild release notes docs with zarr-developers#3769

* add more release notes

* style

* Update release-notes.md

Co-authored-by: Max Jones <14077947+maxrjones@users.noreply.github.com>

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Co-authored-by: Max Jones <14077947+maxrjones@users.noreply.github.com>

update release notes (zarr-developers#3598)

3.1.4 release notes (zarr-developers#3540)

* compile release notes

* add latest release notes

* prose

* typo

* build release notes

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Co-authored-by: Max Jones <14077947+maxrjones@users.noreply.github.com>

Prevent creation of arrays/groups under a parent array (zarr-develope…

…rs#3407)

* restrict arrays as parents of other arrays

* use common save_metadata function for groups and arrays

* add test for creation under a parent array

* fix failing tests

* fix failing doctest

* remove dependency on AsyncGroup

* document changes

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Co-authored-by: Davis Bennett <davis.v.bennett@gmail.com>

generate 3.1.2 release notes (zarr-developers#3404)