refactor(behavior_velocity_planner): export scene module libraries for faster build

[soblin]

export each scene module library and then link the main node for faster build

Signed-off-by: Mamoru Sobue mamoru.sobue@tier4.jp

Description

In this PR each scene_module is compiled to libbehavior_velocity_planner_${scene_module}.so and then the main planner node is linked against them.

If one of the scene module source file, say scene_module/intersection/scene_intersection.cpp, is changed, then only libbehavior_velocity_planner_intersection.so is built and linked again.

Tests performed

(TODO excluding test/ dir)

Measured

time colcon build --packages-up-to behavior_velocity_planner

.

build type	before PR	this PR
clean build	xxx sec	192s
after one src file edit	xxx sec	38s

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