TextAnalyzer constructor Null safety

1. text_analysis
2. text_analysis
3. TextAnalyzer
4. TextAnalyzer constructor

TextAnalyzer class

1. Constructors
2. TextAnalyzer
3. Properties
4. characterFilter
5. hashCode
6. jsonTokenizer
7. nGrammer
8. paragraphSplitter
9. phraseSplitter
10. runtimeType
11. sentenceSplitter
12. syllableCounter
13. termExpander
14. termFilter
15. termSplitter
16. tokenizer
17. Methods
18. noSuchMethod
19. toString
20. Operators
21. operator ==