splitters need to be warmed up

[davidsbatista]

Proposed Changes:

• The HierarchicalDocumentSplitter relies on the DocumentSplitter to build different hierarchy levels. The DocumentSplitter now needs to be warmup if it's meant to split_by="sentence". Therefore in the HierarchicalDocumentSplitteris configured to split_by="sentence" needs to call the .warm_up() on all the different splitters for each level.

How did you test it?

• manual verification + CI tests

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[coveralls]

Pull Request Test Coverage Report for Build 12912847635

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.01%) to 78.691%

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Totals
Change from base Build 12898346371:	0.01%
Covered Lines:	1359
Relevant Lines:	1727

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💛 - Coveralls