Add `name` keyword argument to `Op.__call__`

[jessegrabowski]

Description

Allow arbitrary Ops to be given names. It's a nice way to keep dprints readable and code tidy. Here's what I imagine:

Before:

x = pt.tensor('x', shape=(None,))
y = pt.tensor('y', shape=(None,))
z = pt.add(x, y)
z.name = 'z'

After:

x = pt.tensor('x', shape=(None,))
y = pt.tensor('y', shape=(None,))
z = pt.add(x, y, name='z')

[HarshvirSandhu]

I would like to work on this

@jessegrabowski The dprint of the your example should look something like this right?

Z [id A]
 ├─ x [id B]
 └─ y [id C]

[ricardoV94]

You don't need to change the dprint.

The behavior to look for is that z.name == "z" after your changes.

In the dprint, it will look slightly different for z, as it is not a root variable. It will show it to the right

[ricardoV94]

Feel free to work on it @HarshvirSandhu