Profiling of the `Splash` module

[tztsai]

Description

Profiling tests are now put into the tests/profiling folder. A test file test_profiling_splash.py is created in this folder to profile the performance of the Splash module.

Fixes #166

Type of change

• [x] New feature (non-breaking change which adds functionality)

Key checklist

• [x] Make sure you've run the pre-commit checks: $ pre-commit run -a
• [x] All tests pass: $ poetry run pytest

Further checks

• [x] Code is commented, particularly in hard-to-understand areas
• [x] Tests added that prove fix is effective or that feature works

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.80%. Comparing base (1f60bdb) to head (80a5d99).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #181 +/- ## ======================================== Coverage 93.80% 93.80% ======================================== Files 28 28 Lines 1468 1468 ======================================== Hits 1377 1377 Misses 91 91 ```

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