Add rephrasal parser option to run_experiment command

[rchan26]

For #111. Can now run a parser on the rephrasal output by adding a function in src/rephrasal_parser.py and to the PARSER_FUNCTIONS dictionary in that script.

When running an experiment, you can use the --rephrase-parser argument, e.g. to run an experiment with rephraser and judge, you can use:

prompto_run_experiment \
    --file xstest_small.jsonl \
    --max-queries 6 \
    --rephrase-folder rephrase \
    --rephrase-templates template.txt \
    --rephrase-model ollama-mistral \
    --rephrase-parser split_numbered_list \
    --judge-folder judge \
    --judge ollama-llama3-2

split_numbered_list is a simple function to parse a string which has numbered lists. It will create a list of the numbered items, removing quotation marks and things with brackets which are often provided by models to give disclaimers.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 53.12500% with 30 lines in your changes missing coverage. Please review.

Project coverage is 65.10%. Comparing base (52e4a39) to head (53a37ee).

Files with missing lines	Patch %	Lines
src/prompto/rephrasal_parser.py	27.58%	21 Missing ⚠️
src/prompto/rephrasal.py	71.42%	8 Missing ⚠️
src/prompto/scripts/run_experiment.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
- Coverage   65.51%   65.10%   -0.42%     
==========================================
  Files          41       42       +1     
  Lines        2439     2496      +57     
==========================================
+ Hits         1598     1625      +27     
- Misses        841      871      +30     

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[fedenanni]

@rchan26 all looks good - i just left a quick question, but it's all good to go