Allow query conditions on dense array dimensions

[kounelisagis]

This PR removes Python-side guard that blocked query conditions on dimensions for dense arrays. This was originally added in #722 when Core didn't support QC on dimensions at all. Core has supported this since PR TileDB-Inc/TileDB#3887 but the Python guard was never updated.

[ktsitsi]

What happens if the attribute and the dimension have the same id? How is this resolved?

[kounelisagis]

What happens if the attribute and the dimension have the same id? How is this resolved?

Core's ArraySchema::check_attribute_dimension_label_names() throws on ArraySchema creation. So, that's not possible:

>>> import tiledb, numpy as np
>>> dom = tiledb.Domain(tiledb.Dim(name='x', domain=(0, 9), tile=10, dtype=np.int32))                                                               
>>> attr = tiledb.Attr(name='x', dtype=np.int32)                               
>>> schema = tiledb.ArraySchema(domain=dom, attrs=[attr])                      
TileDBError: ArraySchema: Array schema check failed; Attributes, dimensions and
   dimension labels must have unique names

[ktsitsi]

LGTM!