airframe-benchmark: Aggregate benchmark programs into one project

[xerial]

This will show benchmark results like this: (cc: @smdmts)

$ airframe-benchmark bench json
...
Benchmark                    Mode  Cnt     Score     Error  Units
BooleanArray.airframe       thrpt   10  6761.438 ± 746.598  ops/s
BooleanArray.circe          thrpt   10  7814.689 ± 156.190  ops/s
BooleanArray.json4sJackson  thrpt   10  4542.184 ± 371.709  ops/s
DoubleArray.airframe        thrpt   10   313.818 ±  61.519  ops/s
DoubleArray.circe           thrpt   10  2292.542 ± 521.319  ops/s
DoubleArray.json4sJackson   thrpt   10   304.533 ±  45.359  ops/s
LongArray.airframe          thrpt   10   513.730 ±  39.639  ops/s
LongArray.circe             thrpt   10  1116.723 ±  91.199  ops/s
LongArray.json4sJackson     thrpt   10   509.180 ±  88.176  ops/s
StringArray.airframe        thrpt   10   292.819 ±  49.211  ops/s
StringArray.circe           thrpt   10  1255.126 ± 252.980  ops/s
StringArray.json4sJackson   thrpt   10   954.599 ± 283.134  ops/s
TwitterJSON.airframe        thrpt   10   215.399 ±  38.268  ops/s
TwitterJSON.circe           thrpt   10   635.751 ± 144.779  ops/s
TwitterJSON.json4sJackson   thrpt   10   611.935 ±  68.719  ops/s

This result tells that circe is quite fast in parsing numbers (double, long) and strings.

[codecov]

Codecov Report

Merging #573 into master will decrease coverage by 0.8%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #573      +/-   ##
==========================================
- Coverage   83.75%   82.95%   -0.81%     
==========================================
  Files         225      226       +1     
  Lines        8245     8284      +39     
  Branches      617      609       -8     
==========================================
- Hits         6906     6872      -34     
- Misses       1339     1412      +73

Impacted Files	Coverage Δ
.../airframe/benchmark/msgpack/MsgpackBenchmark.scala	0% <ø> (ø)
...scala/wvlet/airframe/benchmark/BenchmarkMain.scala	0% <0%> (ø)
.../wvlet/airframe/benchmark/json/JSONBenchmark.scala	0% <0%> (ø)
...cala/wvlet/airframe/msgpack/spi/OffsetPacker.scala	98.11% <0%> (+2.51%)	⬆️

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