ete3 warning masks other ImportErrors

[Moomboh]

Describe the bug

To Reproduce

Steps to reproduce the behavior:

1. Install pyqt5, ete3 and pertpy
2. Assert import ete3 works fine
3. import pertpy as pt -> shows warning for ete3

Actual behaviour
Warning appears:

To use sccoda or tasccoda please install ete3 with `pip install ete3`

Expected behavior
No warning when ete3 available.

System [please complete the following information]:

• OS: macOS 13.1, Apple M1 Max
• Language Version: Python 3.9
• Virtual environment: micromamba with:

  # environment.yaml
  name: pertpy-apple-silicon
  channels:
    - conda-forge
  dependencies:
    - python=3.9
    - rpy2

  brew install qt5
  # make sure to add all the environment variables to your .zshrc
  # as described at the end of the output of the brew install command
  # then reload your shell:
  zsh
  create environment with mamba (conda should work as well, but I haven't tested it)
  mamba create -f environment.yaml -n pertpy-apple-silicon
  mamba activate pertpy-apple-silicon
  pip install pyqt5 --config-settings --confirm-license= --verbose
  pip install ete3
  pip install git+https://github.com/theislab/pertpy.git

Additional context

Bug in pertpy/tools/init.py#L10
There are faulty import paths getting masked by the catching of the ImportError for the ete3 warning.
from pertpy.tools.coda._sccoda import Sccoda works fine.

Follow up on #201