N5 root array fix (#1094)

* put n5 attribute in top-level metadata for arrays

* flake8

* normalize temp var name

* remove n5 keyword from results of __getitem__

* partial fix for hexdigest tests

* use a different strategy for n5 attribute management, and general cleanups

* remove test exclusion and cast of partial chunk handling to bytes

* add n5-specific tests file

* add an additional codec to test_compressors

* expand n5 test coverage

* pin werkzeug to get CI working

* appease the typechecker by introducing a new var in compressor_config_to_n5

* release notes

* remove tobytes and improve n5 chunk wrapper test

* Update docs/release.rst

Co-authored-by: jakirkham <[email protected]>
Co-authored-by: Josh Moore <[email protected]>

Author: 3 people

docs/release.rst

@@ -29,6 +29,14 @@ Maintenance
   By :user:`Saransh Chopra <Saransh-cpp>` :issue:`1079`.
 
 
+Bug fixes
+~~~~~~~~~
+
+* Fix bug in N5 storage that prevented arrays located in the root of the hierarchy from
+  bearing the `n5` keyword. Along with fixing this bug, new tests were added for N5 routines
+  that had previously been excluded from testing, and type annotations were added to the N5 codebase.
+  By :user:`Davis Bennett <d-v-b>`; :issue:`1092`.
+
 .. _release_2.12.0:
 
 2.12.0