feat: Phrase short sentence handling

[crumblecoding]

Allow setting short sentence handling options via cli, including phrase short sentence handling.

This PR is the corresponding PR to buchwandler/pykokoro#4 and most details can be found there.

bug fix

Fixed #1

Extended Summary

• Added note on short sentence handling to summary to advice users about the possibility to increase the threshold.
• added used short sentence config to summary

CLI Extensions

• removed --enable-short-sentence (since its the default and produces better results in most cases)
• added --short-sentence TEXT, which allows for fine-grained configuration like "mode=phrase,selection=auto,max-tries=4,threshold=30"
• added "--seed NUMBER" to set the random seed via cli, helps with testing and consistency, since randomized phrase mode uses the seed as well.

AI Usage Disclaimer

AI has been used to create most of the code in this PR, though, I have reviewed, tested and verified the results.
Code structure, cli arguments, and config structure were chosen by me, not the AI.

[holgern]

Thanks a lot for this PR.