Remove shape=None default in dpnp.reshape (#2673)

This PR updates the signature of `dpnp.reshape` by removing `None`
default value for `shape` argument
and requiring it to be passed explicitly according to [Python array API
](https://data-apis.org/array-api/draft/API_specification/generated/array_api.reshape.html#reshape)

Author: vlad-perevezentsev

CHANGELOG.md

@@ -37,6 +37,7 @@ Also, that release drops support for Python 3.9, making Python 3.10 the minimum
 * Refactored `dpnp.fft` and `dpnp.random` submodules by removing wildcard imports and defining explicit public exports [#2649](https://github.com/IntelPython/dpnp/pull/2649)
 * Added support for the `out` keyword to accept a tuple, bringing ufunc signatures into alignment with those in NumPy [#2664](https://github.com/IntelPython/dpnp/pull/2664)
 * Unified public API definitions in `dpnp.linalg` and `dpnp.scipy` submodules [#2663](https://github.com/IntelPython/dpnp/pull/2663)
+* Aligned the signature of `dpnp.reshape` function with Python array API by making `shape` a required argument [#2673](https://github.com/IntelPython/dpnp/pull/2673)
 
 ### Deprecated
 

dpnp/dpnp_iface_manipulation.py

@@ -3013,7 +3013,7 @@ def require(a, dtype=None, requirements=None, *, like=None):
     return arr
 
 
-def reshape(a, /, shape=None, order="C", *, copy=None):
+def reshape(a, /, shape, order="C", *, copy=None):
     """
     Gives a new shape to an array without changing its data.
 
@@ -3028,8 +3028,6 @@ def reshape(a, /, shape=None, order="C", *, copy=None):
         an integer, then the result will be a 1-D array of that length.
         One shape dimension can be -1. In this case, the value is
         inferred from the length of the array and remaining dimensions.
-
-        Default: ``None``.
     order : {None, "C", "F", "A"}, optional
         Read the elements of `a` using this index order, and place the
         elements into the reshaped array using this index order. ``"C"``
@@ -3113,11 +3111,6 @@ def reshape(a, /, shape=None, order="C", *, copy=None):
 
     """
 
-    if shape is None:
-        raise TypeError(
-            "reshape() missing 1 required positional argument: 'shape'"
-        )
-
     if order is None:
         order = "C"
     elif order in "aA":