Add a regex benchmark for comparison

[gavlyukovskiy]

Had a thought to check how bad regex is doing, I'm honestly surprised it's doing quite okay (only 120-200 times slower than json-masker) 😄

Benchmark                                                             (jsonSize)  (maskedKeyProbability)  (obfuscationLength)   Mode  Cnt        Score   Error  Units
JsonMaskerBenchmark.baselineCountBytes         1kb                    0.01                 none  thrpt       3196601,040          ops/s
JsonMaskerBenchmark.baselineCountBytes       128kb                    0.01                 none  thrpt         23401,364          ops/s
JsonMaskerBenchmark.baselineCountBytes         2mb                    0.01                 none  thrpt          1462,554          ops/s
JsonMaskerBenchmark.jacksonString              1kb                    0.01                 none  thrpt         91196,798          ops/s
JsonMaskerBenchmark.jacksonString            128kb                    0.01                 none  thrpt           491,485          ops/s
JsonMaskerBenchmark.jacksonString              2mb                    0.01                 none  thrpt            18,792          ops/s
JsonMaskerBenchmark.jsonMaskerBytes            1kb                    0.01                 none  thrpt        983466,058          ops/s
JsonMaskerBenchmark.jsonMaskerBytes          128kb                    0.01                 none  thrpt          5229,711          ops/s
JsonMaskerBenchmark.jsonMaskerBytes            2mb                    0.01                 none  thrpt           297,844          ops/s
JsonMaskerBenchmark.jsonMaskerString           1kb                    0.01                 none  thrpt        824710,487          ops/s
JsonMaskerBenchmark.jsonMaskerString         128kb                    0.01                 none  thrpt          3697,972          ops/s
JsonMaskerBenchmark.jsonMaskerString           2mb                    0.01                 none  thrpt           279,800          ops/s
JsonMaskerBenchmark.regexList                  1kb                    0.01                 none  thrpt         40465,063          ops/s
JsonMaskerBenchmark.regexList                128kb                    0.01                 none  thrpt            42,897          ops/s
JsonMaskerBenchmark.regexList                  2mb                    0.01                 none  thrpt             2,307          ops/s

[gavlyukovskiy]

Need to redo benchmarks on my PC to make sure values are consistent

[Breus]

@gavlyukovskiy 120-200 times slower with no support for array and object masking which are by far the most expensive parts of masking 😄

[sonarqubecloud]

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[gavlyukovskiy]

@Breus I've also added benchmark parameter that uses different character sets and results are quite bad - every time we do any array resize (have quotes, use unicode or obfuscation length) then performance drops below regexes for a large json :(

[Breus]

@gavlyukovskiy we could add an "ultra-performant" configuration which doesn't resize at all for escaped quotes and unicode characters but replaces them by the same length mask in bytes. This could also be something we add in a later version of the library.

For the rest: The fact that obfuscation slows down the algorithm and is slower than a regex without that seems logical and not something to address: if you would do the same with a regex/jackson, it would quite likely be much slower than this library.