Add more benches

[taiki-e]

Split from #68

Note that bench_rctree_concurrent_*_N benchmarks N get/set operations from 4 threads.

bench_rctree            time:   [1.6606 us 1.6751 us 1.6907 us]
Found 3 outliers among 100 measurements (3.00%)
  3 (3.00%) high severe

bench_rctree_get_joints time:   [260.14 ns 262.78 ns 266.16 ns]
Found 11 outliers among 100 measurements (11.00%)
  7 (7.00%) high mild
  4 (4.00%) high severe

bench_rctree_set_joints time:   [233.88 ns 234.96 ns 236.25 ns]
Found 5 outliers among 100 measurements (5.00%)
  4 (4.00%) high mild
  1 (1.00%) high severe

bench_rctree_concurrent_set_joints_1000
                        time:   [2.7615 ms 2.7667 ms 2.7727 ms]
Found 5 outliers among 100 measurements (5.00%)
  1 (1.00%) low mild
  4 (4.00%) high severe

bench_rctree_concurrent_get_joints_1000
                        time:   [2.7493 ms 2.7566 ms 2.7651 ms]
Found 5 outliers among 100 measurements (5.00%)
  3 (3.00%) high mild
  2 (2.00%) high severe

bench_rctree_concurrent_set_get_joints_1000
                        time:   [2.7501 ms 2.7562 ms 2.7632 ms]
Found 8 outliers among 100 measurements (8.00%)
  4 (4.00%) high mild
  4 (4.00%) high severe

bench_rctree_ik         time:   [7.2494 us 7.2975 us 7.3501 us]
Found 9 outliers among 100 measurements (9.00%)
  6 (6.00%) high mild
  3 (3.00%) high severe

[codecov]

Codecov Report

Merging #69 (d808186) into main (0d1f0d0) will decrease coverage by 0.39%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
- Coverage   73.78%   73.39%   -0.40%     
==========================================
  Files          14       14              
  Lines        1049     1056       +7     
  Branches      126      124       -2     
==========================================
+ Hits          774      775       +1     
- Misses        172      178       +6     
  Partials      103      103              

Impacted Files	Coverage Δ
src/funcs.rs	76.56% <0.00%> (-2.47%)	⬇️
src/urdf.rs	69.56% <0.00%> (-0.74%)	⬇️
src/ik.rs	63.10% <0.00%> (-0.54%)	⬇️
src/node.rs	87.41% <0.00%> (ø)
src/chain.rs	77.72% <0.00%> (ø)
src/iterator.rs	95.00% <0.00%> (ø)
src/joint/joint.rs	75.30% <0.00%> (ø)
src/joint/joint_type.rs	29.16% <0.00%> (ø)

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