Expose discard_compound_token option to kuromoji_tokenizer

[johtani]

In Lucene 8.5, Japanese Tokenizer introduced new option DiscardCmpoundToken(LUCENE-9123)

This PR exposes new option to Elasticsearch kuromoji plugin.

And I found 2 bug around Kuromoji Tokenizer.

1. Fix typo(discartPunctuation) in KuromojiTokenizerFactory
2. Fix documentation bug in kuromoji_tokenizer extended mode
   • The extended mode output of 関西国際空港 is same as search mode output.

Please let me know, if I should split this PR to new feature and fix typo.

• Have you signed the contributor license agreement? Yes
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• If submitting code, have you built your formula locally prior to submission with gradle check? Yes, with -p plugins/analysis-kuromoji option
• If submitting code, is your pull request against master? Unless there is a good reason otherwise, we prefer pull requests against master and will backport as needed. Yes, against master
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• If you are submitting this code for a class then read our policy for that. Yes

[elasticmachine]

Pinging @elastic/es-search (:Search/Analysis)

[jimczi]

@elasticmachine ok to test

[jimczi]

@elasticmachine update branch

[jimczi]

LGTM, It's nice to see you around here again @johtani ;)

[johtani]

@jimczi Thanks for reviewing my PR :D