feat!: add support for ndarray data type objects and update existing type definitions

This commit adds support for ndarrays having data type objects
representing the underlying data type. This is part of the general
effort to move beyond dtype strings to represent data types. As
such, users directly accessing `x.dtype` may now no longer receive
a string, but a data type object/instance. Accordingly, users are
advised to use `ndarray/dtype` for accessing the dtype of an ndarray
and, if a string is desired, to call `String(dt)` on the returned
value from `ndarray/dtype`. In general, directly accessing ndarray
property values is discouraged. Instead, use functional accessors.
Because this change impacts all ndarray type definitions which
previously stipulated that the dtype of an ndarray should be a string,
this is a breaking change.

BREAKING CHANGE: add support for data type objects

To migrate, users should avoid accessing ndarray properties via
property accessors and instead use functional APIs, such as
`@stdlib/ndarray/dtype`. If a string is expected, wrap the call
to `ndarray/dtype` with `String(dt)` to force the dtype value to
always be a string.

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
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Author: kgryte