move tsea.py into tutorial submodule

[chanind]

Description

This PR moves tsea.py in to a tutorial submodule so it's available to the main tutorial when saelens is installed via pip

Fixes #419

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.26%. Comparing base (38370d4) to head (b48b6a1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #420   +/-   ##
=======================================
  Coverage   74.26%   74.26%           
=======================================
  Files          19       19           
  Lines        3171     3171           
  Branches      456      456           
=======================================
  Hits         2355     2355           
  Misses        659      659           
  Partials      157      157           

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[anthonyduong9]

Let's add a newline at end of file?