Remove use of boost from polygon_filter

[traversaro]

The PR #161 removed all uses of boost from the library, however #189 re-introduced the use of boost in polygon_filter, but without reintroducing the required CMake code and package.xml metadata.

This PR removes the use of boost from polygon_filter, like #161 did for the rest of the library.

[jonbinney]

Something happening in the rolling tests with the renamed tf2 headers - i'll take a closer look this week.

[jonbinney]

CI is failing on rolling because laser_geometry switched to use the newly provided hpp header for buffer_core from tf2, but the docker container used by CI has an old version of tf2 from before that hpp file was added. Since the failure is not due to this PR (and the main ros2 branch will fail CI in the same way right now) I'm OK merging this.

[jonbinney]

LGTM

[traversaro]

CI is failing on rolling because laser_geometry switched to use the newly provided hpp header for buffer_core from tf2, but the docker container used by CI has an old version of tf2 from before that hpp file was added. Since the failure is not due to this PR (and the main ros2 branch will fail CI in the same way right now) I'm OK merging this.

Thanks!