fix(interpolation): use slerp for spherical_linear_interpolation

[takayuki5168]

Signed-off-by: Takayuki Murooka takayuki5168@gmail.com

Description

slerp means spherical_linear_interpolation although we use slerp for spline interpolation.
In this PR, we will use slerp for spherical_linear_interpolation, and spline for spline interpolation

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[codecov]

Codecov Report

Merging #1769 (5f58020) into main (8c2080c) will not change coverage.
The diff coverage is 18.98%.

@@           Coverage Diff           @@
##             main    #1769   +/-   ##
=======================================
  Coverage   10.38%   10.38%           
=======================================
  Files        1212     1212           
  Lines       87402    87402           
  Branches    20274    20274           
=======================================
  Hits         9081     9081           
  Misses      68842    68842           
  Partials     9479     9479           

Flag	Coverage Δ		*Carryforward flag
differential	12.37% <18.98%> (?)
total	10.37% <18.98%> (ø)		Carriedforward from 8c2080c

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
...ion/include/interpolation/spline_interpolation.hpp	28.57% <ø> (ø)
...e/interpolation/spline_interpolation_points_2d.hpp	83.33% <ø> (ø)
...ion_common/include/motion_common/motion_common.hpp	0.00% <0.00%> (ø)
.../motion_common/src/motion_common/motion_common.cpp	2.12% <0.00%> (ø)
...mmon/perception_utils/src/predicted_path_utils.cpp	49.05% <0.00%> (ø)
control/trajectory_follower/src/mpc_utils.cpp	58.25% <0.00%> (ø)
...eption/map_based_prediction/src/path_generator.cpp	0.00% <0.00%> (ø)
...th_planner/src/scene_module/utils/path_shifter.cpp	0.00% <0.00%> (ø)
...g/obstacle_avoidance_planner/src/mpt_optimizer.cpp	0.00% <0.00%> (ø)
planning/obstacle_avoidance_planner/src/node.cpp	0.00% <ø> (ø)
... and 7 more

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[rej55]

LGTM