src: add ASCII table constants
Since we are refactoring ASCII character values into another separate file, as in the referred PR. Why not create the entire ASCII character to values mapping for future reference and completeness.
Refs: https://github.com/nodejs/node/pull/18654
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines