Move "include" directory to project

[feluelle]

Description

What is the current behavior?

See the referenced issue for details.

closes: #1440

What is the new behavior?

After reading python-poetry/poetry#2015, it seems the best solution is to include the "include" directory directly in the project.

Does this introduce a breaking change?

No.

Checklist

• Created tests which fail without the change (if possible)
• Extended the README / documentation, if necessary

[codecov]

Codecov Report

Base: 94.06% // Head: 97.59% // Increases project coverage by +3.52% 🎉

Coverage data is based on head (4e624b3) compared to base (ba25f0c).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1560      +/-   ##
==========================================
+ Coverage   94.06%   97.59%   +3.52%     
==========================================
  Files          89       22      -67     
  Lines        4417      789    -3628     
  Branches      440        0     -440     
==========================================
- Hits         4155      770    -3385     
+ Misses        178       19     -159     
+ Partials       84        0      -84     

Impacted Files	Coverage Δ
sql-cli/sql_cli/project.py	97.64% <100.00%> (ø)
python-sdk/src/astro/utils/load.py
python-sdk/src/astro/sql/table.py
...thon-sdk/src/astro/sql/operators/export_to_file.py
python-sdk/src/astro/constants.py
python-sdk/src/astro/files/types/ndjson.py
...dk/src/astro/databricks/load_file/load_file_job.py
python-sdk/src/astro/sql/operators/export_file.py
python-sdk/src/astro/databases/google/bigquery.py
...hon-sdk/src/astro/files/locations/google/gdrive.py
... and 58 more

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