feat(build)!: add forward declaration header

[soblin]

Description

Add forward declaration header just as lanelet2_core lanelet2_routing package.

Related links

Tests performed

build passes

Notes for reviewers

Interface changes

This PR adds forward declaration header

Effects on system behavior

Not applicable.

Pre-review checklist for the PR author

The PR author must check the checkboxes below when creating the PR.

• I've confirmed the contribution guidelines.
• The PR follows the pull request guidelines.

In-review checklist for the PR reviewers

The PR reviewers must check the checkboxes below before approval.

• The PR follows the pull request guidelines.
• The PR has been properly tested.
• The PR has been reviewed by the code owners.

Post-review checklist for the PR author

The PR author must check the checkboxes below before merging.

• There are no open discussions or they are tracked via tickets.
• The PR is ready for merge.

After all checkboxes are checked, anyone who has write access can merge the PR.

[mitsudome-r]

LGTM

[soblin]

@mitsudome-r Can you run the build test workflows ?

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.31% ⚠️

Comparison is base (58039c8) 10.30% compared to head (5465090) 10.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #203      +/-   ##
==========================================
- Coverage   10.30%   10.00%   -0.31%     
==========================================
  Files          36       36              
  Lines        2629     2629              
  Branches     1366     1366              
==========================================
- Hits          271      263       -8     
- Misses       1913     1925      +12     
+ Partials      445      441       -4     

Flag	Coverage Δ		*Carryforward flag
differential	8.23% <0.00%> (?)
total	10.04% <ø> (-0.26%)	⬇️	Carriedforward from 58039c8

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

Files Changed	Coverage Δ
...ion/regulatory_elements/autoware_traffic_light.hpp	50.00% <ø> (ø)
...n/include/lanelet2_extension/utility/utilities.hpp	∅ <ø> (∅)
tmp/lanelet2_extension/lib/message_conversion.cpp	39.75% <ø> (ø)
tmp/lanelet2_extension/lib/query.cpp	7.17% <ø> (ø)
tmp/lanelet2_extension/lib/route_checker.cpp	77.77% <ø> (ø)
tmp/lanelet2_extension/lib/utilities.cpp	7.69% <0.00%> (-0.31%)	⬇️
tmp/lanelet2_extension/lib/visualization.cpp	0.00% <ø> (ø)
...et2_extension/test/src/test_message_conversion.cpp	19.67% <ø> (ø)
tmp/lanelet2_extension/test/src/test_query.cpp	19.29% <ø> (ø)
...lanelet2_extension/test/src/test_route_checker.cpp	37.93% <ø> (ø)
... and 1 more

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.