Move elevation map loader

[taichiH]

Description

move elevation_map_loader from map_loader to create new elevation_map_loader as a member of perception module.

Review Procedure

This PR depend on these pull requests

• add pcd map hash generator #745
• input pointcloud_map_path to map_hash_generator autoware_launch-old#142
• update msg to publish pcd hash AutowareArchitectureProposal_api_msgs#1

please merge this pr with

• https://github.com/tier4/autoware_launcher.eva/pull/207
• Add elevation map loader to ground seg launch autoware_launch-old#136

Remarks

Pre-Review Checklist for the PR Author

PR Author should check the checkboxes below when creating the PR.

• Read pull request guidelines
• Code follows coding guidelines
• Assign PR to reviewer

Checklist for the PR Reviewer

Reviewers should check the checkboxes below before approval.

• Commits are properly organized and messages are according to the guideline
• Code follows coding guidelines
• (Optional) Unit tests have been written for new behavior
• PR title describes the changes

Post-Review Checklist for the PR Author

PR Author should check the checkboxes below before merging.

• All open points are addressed and tracked via issues or tickets
• Write release notes

CI Checks

• Build and test for PR / build-and-test-pr: Required to pass before the merge.
• Build and test for PR / clang-tidy-pr: NOT required to pass before the merge. It is up to the reviewer(s). Found false positives? See the guidelines.
• Check spelling: NOT required to pass before the merge. It is up to the reviewer(s). See here if you want to add some words to the spell check dictionary.

[taichiH]

merge after #745

[taichiH]

build and test is failed because tier4/AutowareArchitectureProposal_api_msgs#1 hasn't been merged yet.

[kosuke55]

Would you please add following params to elevation_map_parameters.yaml?

    height_type: 1
    height_thresh: 1.0

mistake review