refactor(blind_spot): find first_conflicting_lane just as intersection module (autowarefoundation#873)

temp

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

Author: soblin

autoware_launch/config/planning/scenario_planning/lane_driving/behavior_planning/behavior_velocity_planner/blind_spot.param.yaml

@@ -4,7 +4,7 @@
       use_pass_judge_line: true
       stop_line_margin: 1.0 # [m]
       backward_length: 50.0 # [m]
-      ignore_width_from_center_line: 0.7 # [m]
+      ignore_width_from_center_line: 0.0 # [m]
       max_future_movement_time: 10.0 # [second]
       threshold_yaw_diff: 0.523 # [rad]
       adjacent_extend_width: 1.5 # [m]