Add script for computing Premixed flamelets

[baperry2]

Also includes some minor extensions for the TomlParmParse utility that became helpful for this.

[Copilot]

Pull request overview

This PR adds a new script for computing premixed flamelets using Cantera and extends the TomlParmParse utility with helpful features.

• New script compute_premixed_flamelets.py generates 1D unstrained premixed flames across various conditions (pressure, temperature, composition)
• Enhanced TomlParmParse with choices parameter validation, require_output option, and support for directory-based output paths
• Added scalar_to_list utility function for flexible scalar/list input handling

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
run_scripts/cantera/compute_premixed_flamelets.py	New script implementing premixed flamelet computations with MPI support and multiple composition specification methods
run_scripts/cantera/compute_premixed_flamelets.toml	Example configuration file for the premixed flamelet script
cmlm/utils/input_file.py	Extended TomlParmParse with choices validation, directory output support, and added scalar_to_list helper function
run_scripts/ctable/create_spray_table_nd.py	Refactored species list handling and simplified documentation
run_scripts/ctable/create_dummy_table_nd.py	Simplified documentation format
docs/run-scripts.rst	Added documentation for new premixed flamelet script and general TomlParmParse usage
docs/conf.py	Added path for cantera run_scripts directory to enable documentation generation

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