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Optimized scalar parsing (#409)

* move scalar node creation from deserializer to scalar_parser

* separate unescaping for single quoted scalars from lexical analysis

* create a function exclusively for plain scalar range detection (outside flow context)

* added state of whether owned buffer is used in scalar_parser

* merged scanning plain scalars when inside/outside flow contexts in lexer

* separate parsing of double quoted scalar from lexer's scanning

* added runtime assertions & cleaned up unused codes

* made basic_str_view ctors constexpr if applicable

* separate block scalar parsing from lexer's scanning

* removed owned buffer in lexer

* wip: adding tests for scalar_parser class

* separate node creation depending on lexical token type

* reduced unnecessary branching in lexer's scanning of scalars

* added test cases for scalar_parser

* added missing function header comments

* updated benchmarking scores

* fixed warnings and errors

1310 of 1310 branches covered (100.0%)

Branch coverage included in aggregate %.

4633 of 4633 relevant lines covered (100.0%)

320.99 hits per line