Move ipython to extra dependencies

[sobolevn]

ipython is not required anywhere except local machine. Moreover, not all developers use it.
Maybe we can move to some new extra dependency section?

We can even create more of them later.

[DmytroLitvinov]

Hello @sobolevn .

Personally I, use it at shell and shell_plus managements commands.
It is very useful, because it has autocomplete and it loads all of the models.

I think we can use it under dev-dependencies.

[DmytroLitvinov]

I agree with you that it is not required package under main dependencies(production probably), but for local machine(dev) it is very useful.
What do you think?

[sobolevn]

Same, I just try to find the ways to speed up the docker builds inside the CI.

[sobolevn]

https://github.com/sdispater/poetry#extras

[sobolevn]

» poetry install -E ipython
Installing dependencies from lock file


Package operations: 13 installs, 0 updates, 0 removals

  - Installing ipython-genutils (0.2.0)
  - Installing parso (0.3.4)
  - Installing ptyprocess (0.6.0)
  - Installing pygments (2.3.1)
  - Installing wcwidth (0.1.7)
  - Installing appnope (0.1.0)
  - Installing backcall (0.1.0)
  - Installing jedi (0.13.3)
  - Installing pexpect (4.6.0)
  - Installing pickleshare (0.7.5)
  - Installing prompt-toolkit (2.0.9)
  - Installing traitlets (4.3.2)
  - Installing ipython (7.3.0)

(.venv) ~/Documents/PyCharmProjects/...  master ✗
» poetry install -E docs
Installing dependencies from lock file


Package operations: 10 installs, 0 updates, 0 removals

  - Installing pyparsing (2.3.1)
  - Installing alabaster (0.7.12)
  - Installing babel (2.6.0)
  - Installing imagesize (1.1.0)
  - Installing packaging (19.0)
  - Installing sphinxcontrib-websupport (1.1.0)
  - Installing pockets (0.7.2)
  - Installing sphinx (1.8.5)
  - Installing sphinx-autodoc-typehints (1.6.0)
  - Installing sphinxcontrib-napoleon (0.7)```

[sobolevn]

There are several problems:

1. poetry has bugs related to extras How can I specify differing sets of dependency extras for each of my project's extras? python-poetry/poetry#834 and Automatically add extras entry for --optional python-poetry/poetry#772
2. we need to somehow pass these --extra params to docker build
3. this needs to work differently for different envs (so, clearly no ipython on prod)

[sobolevn]

I will put this on hold for now.