Fix parquet read speed example

[tomjholland]

This pull request includes changes to multiple Jupyter notebooks in the docs/source/examples directory. The main goal of these changes is to improve the structure and readability of the notebooks by separating the installation of dependencies into their own code cells.

Improvements to notebook structure:

• docs/source/examples/analysing-GITT-data.ipynb: Moved the %pip install matplotlib command to its own code cell.
• docs/source/examples/comparing-pyprobe-performance.ipynb: Moved the %pip install matplotlib and %pip install pandas commands to their own code cells.
• docs/source/examples/differentiating-voltage-data.ipynb: Moved the %pip install matplotlib command to its own code cell.
• docs/source/examples/filtering-data.ipynb: Moved the %pip install matplotlib command to its own code cell.
• docs/source/examples/getting-started.ipynb: Moved the %pip install matplotlib command to its own code cell.
• docs/source/examples/ocv-fitting.ipynb: Moved the %pip install matplotlib command to its own code cell.
• docs/source/examples/plotting.ipynb: Moved the %pip install matplotlib command to its own code cell.
• docs/source/examples/sharing-data.ipynb: Added a new code cell for the %pip install matplotlib command.
• docs/source/examples/working-with-pybamm-models.ipynb: Moved the %pip install ipywidgets command to its own code cell.

Additionally, there was a minor change to the file name used in the measure_pyprobe function call in the comparing-pyprobe-performance.ipynb notebook:

• docs/source/examples/comparing-pyprobe-performance.ipynb: Changed the file name in the measure_pyprobe function call from sample_data_neware.parquet to sample_data_neware_test.parquet.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.85%. Comparing base (2d02893) to head (9a724c7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #209   +/-   ##
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  Coverage   82.85%   82.85%           
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  Files          27       27           
  Lines        2240     2240           
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  Hits         1856     1856           
  Misses        384      384           

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