[Numpy] more support for boolean indexing/assign and change on implementation

[Alicia1529]

Description

1. implement boolean indexing through advanced indexing by following the below method

In general if an index includes a Boolean array, the result will be identical to inserting obj.nonzero() into the same position and using the integer array indexing mechanism described above. x[ind_1, boolean_array, ind_2] is equivalent to x[(ind_1,) + boolean_array.nonzero() + (ind_2,)].

2. support boolean indexing/assign mixed with other ndarray

3. support boolean assign without restriction on position (previously only support at most one boolean array at the end of the index array)

4. support True/ array(True), False/array(False) as part of the indices

[haojin2]

LGTM

[ciyongch]

@Alicia1529 , can you help to back port this PR to v1.7.x and v1.x branches as well, which will be included in the upcoming 1.7.0 release? As the issue is existing in these two branches so far. Thanks!

[Alicia1529]

@Alicia1529 , can you help to back port this PR to v1.7.x and v1.x branches as well, which will be included in the upcoming 1.7.0 release? As the issue is existing in these two branches so far. Thanks!

Hi, sorry for my late reply. I will do it within this weekend.

[ciyongch]

Thanks @Alicia1529 , please also tag me when the new PRs are created.