Compare json_view with yyjson, simdjson, and Boost.JSON

tests/benchmarks/json_view/ holds the comparison with other libraries,
which is not built by CMake or run by CI:

- bench_view.cpp: parse, traverse, select, and dump of twitter,
  citm_catalog, canada, jeopardy, a single tweet, and a JSON-RPC request,
  with json_view, yyjson, simdjson (DOM and On-Demand), Boost.JSON, and
  json::parse; all engines must agree on every document before anything
  is timed, and run interleaved in every round
- bench_corpus.cpp: parse, traverse, and dump of any list of files
- compare.py: builds both against include/ with the libraries of the
  system (or pinned downloads), runs them, and writes the results with
  what is needed to reproduce them (date, commit, CPU, OS, compiler,
  flags, library versions) to results/<date>-<host>.md and .csv; only the
  Python 3 standard library is used
- README.md: how to run it, what is measured, and which features the
  engines have, so the numbers can be read correctly

Boost.JSON is optional (JSON_VIEW_BENCH_BOOST).

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

.github/labeler.yml

@@ -52,6 +52,7 @@ labels:
     - "single_include/nlohmann/json_view\\.hpp"
     - "tests/src/unit-json_view.*"
     - "tests/src/fuzzer-parse_json_view\\.cpp"
+    - "tests/benchmarks/json_view/.*"
     - "tools/amalgamate/config_json_view\\.json"
     - "docs/mkdocs/docs/features/json_view\\.md"
     - "docs/mkdocs/docs/api/basic_json_(document|view)/.*"