Planning: openspace: folder refactor (#8294)

planning: retire task DECIDER_RULE_BASED_STOP and rename it to OPEN_SPACE_PRE_STOP_DECIDER for open-space-parking only

planning: move stop-sign related status in PlanningContext into PlanningContext->PlanningStatus()->stop_sign()

Planning: added path_assessment_decider that will evaluate the validity of optimized path and add extra information for speed decider to use.

* Planning: init checking of stages in valet parking scenario

* Planning: init checking of tasks in valet parking

* Planning: initial checking in of openspace roi decider

* Planning: taking apart long build target

* Planning: add unit tests to valet parking scenario

* Planning: refactor decider folder BUILD file

planning: 1. merged fem_1d_qp_problem. 2. fixed memory leak in unit test. 3. simplifed fem_1d_qp_problem interface