Docstring testing + return sorted table names

[prakaa]

• Ensures that doctests are tested by changing pyproject.toml pytest config for test dirs
• Update docstring example to reflect new tables, new functionality, etc.
• get_table_names now returns a sorted list of tables

Closes #19, closes #17

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files with missing lines	Coverage Δ
src/isp_workbook_parser/config_model.py	100.00% <ø> (ø)
src/isp_workbook_parser/parser.py	84.66% <100.00%> (+4.00%)	⬆️
src/isp_workbook_parser/read_table.py	100.00% <ø> (ø)

[nick-gorman]

Docstrings tests are running, output looks good, and returning table names sorted is definitely the way to go.