Default toolbar overlaps figure

Describe the issue

The default position of the toolbar is on the left, where it overlaps the figure.
Especially when the constrained_layout=True keyword is used when creating the figure,
this is highly undesirable.

Possible solutions or workarounds:

• Minimal fix: Change the default to anything other then "left"; I think that with the current design, "right" would be by far the best. It would minimize the likelihood of an overlap.
• The real fix: When the toolbar_position is on the left, position the figure to its right. Ideally, all toolbar positions should be in boxes that never overlap the figure box. With this scheme I suggest putting the default toolbar on the top or bottom, and flush left, to match all of the other matplotlib interactive backends.

Versions

 3.8.13 | packaged by conda-forge | (default, Mar 25 2022, 06:06:49)
[Clang 12.0.1 ]
ipympl version: 0.9.2
Selected Jupyter core packages...
IPython          : 8.5.0
ipykernel        : 6.16.0
ipywidgets       : 7.7.0
jupyter_client   : 7.3.5
jupyter_core     : 4.11.1
jupyter_server   : 1.23.1
jupyterlab       : 3.5.0
nbclient         : 0.6.8
nbconvert        : 7.0.0
nbformat         : 5.6.1
notebook         : 6.5.2
qtconsole        : 5.3.1
traitlets        : 5.4.0
Known nbextensions:
  config dir: /Users/efiring/.jupyter/nbconfig
    notebook section
      matplotlib/extension  enabled
      - Validating: problems found:
        - require?  X matplotlib/extension
  config dir: /Users/efiring/miniconda3/envs/py38/etc/jupyter/nbconfig
    notebook section
      jupyter-matplotlib/extension  enabled
      - Validating: OK
      jupyter-js-widgets/extension  enabled
      - Validating: OK
JupyterLab v3.5.0
/Users/efiring/miniconda3/envs/py38/share/jupyter/labextensions
        jupyterlab_pygments v0.2.2 enabled OK (python, jupyterlab_pygments)
        jupyter-matplotlib v0.11.2 enabled OK
        @jupyter-widgets/jupyterlab-manager v3.1.1 enabled OK (python, jupyterlab_widgets)

该 issue 的核心是 Jupyter Notebook 集成中的 toolbar_position 行为；首先找到用于放置默认工具栏的实现，以及任何相关的布局测试。使用 constrained_layout=True 重现重叠问题，然后验证在所选定位行为下，工具栏和图形占据相互分离的框。