Add jackson benchmarks

[jzbrooks]

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Jackson still has quite a large user base, so it would be useful to have benchmarks to compare against code-generator serializers.

https://github.com/FasterXML/jackson-databind https://github.com/FasterXML/jackson-module-kotlin

Add benchmarks for every combination of:

1. to/from json
2. string/buffer
3. jackson-databind/jackson-module-kotlin