added helix functions (adopted from STAR)

[starsdong]

Briefly, what does this PR introduce?

What kind of change does this PR introduce?

• Bug fix (issue #__)
• New feature (issue #__)
• Documentation update
• Other: __

Please check if this PR fulfills the following:

• Tests for the changes have been added
• Documentation has been added / updated
• Changes have been communicated to collaborators

Does this PR introduce breaking changes? What changes might users need to make to their code?

Does this PR change default behavior?

[veprbl]

Here is a script to help you test this in EICrecon:

#!/usr/bin/env bash

set -xue

export CMAKE_INSTALL_PREFIX=$PWD/prefix
git clone git@github.com:eic/EDM4eic.git -b pr/helix_utils
pushd EDM4eic
cmake -S . -B build -DBUILD_SHARED_LIBS=ON
cmake --build build -- -j $(nproc)
cmake --install build
popd
git clone git@github.com:eic/EICrecon.git
pushd EICrecon/
git apply <<EOF
diff --git a/cmake/jana_plugin.cmake b/cmake/jana_plugin.cmake
index 8fde2d8c..7fd1be04 100644
--- a/cmake/jana_plugin.cmake
+++ b/cmake/jana_plugin.cmake
@@ -369,7 +369,7 @@ macro(plugin_add_event_model _name)
   # Add libraries (same as target_include_directories but for both plugin and
   # library)
   plugin_link_libraries(\${PLUGIN_NAME} podio::podio EDM4EIC::edm4eic
-                        EDM4HEP::edm4hep)
+                        EDM4HEP::edm4hep edm4eic_helix_utils)
 
 endmacro()
 
diff --git a/src/algorithms/tracking/ActsToTracks.cc b/src/algorithms/tracking/ActsToTracks.cc
index 947299b4..ce18d6f3 100644
--- a/src/algorithms/tracking/ActsToTracks.cc
+++ b/src/algorithms/tracking/ActsToTracks.cc
@@ -11,6 +11,7 @@
 #include <edm4eic/EDM4eicVersion.h>
 #include <edm4eic/RawTrackerHit.h>
 #include <edm4eic/TrackerHit.h>
+#include <edm4eic/helix_utils.h>
 #include <edm4hep/EDM4hepVersion.h>
 #include <edm4hep/MCParticleCollection.h>
 #include <edm4hep/SimTrackerHit.h>
@@ -117,6 +118,9 @@ void ActsToTracks::process(const Input& input, const Output& output) const {
       }
       pars.setCovariance(cov);
 
+      edm4eic::Helix h(pars, 1.7);
+      info("helix curvature is {}", h.curvature());
+
       trajectory.addToTrackParameters(pars);
 
       // Fill tracks
EOF
env CXXFLAGS="-I$CMAKE_INSTALL_PREFIX/include -Wno-error=c++11-narrowing" \
    LDFLAGS="-L$CMAKE_INSTALL_PREFIX/lib" \
cmake -S . -B build -DEDM4EIC_ROOT=$CMAKE_INSTALL_PREFIX
cmake --build build -- -j $(nproc)
cmake --install build
popd

source /opt/detector/epic-main/bin/thisepic.sh epic_craterlake_10x100
ddsim --compactFile $DETECTOR_PATH/$DETECTOR_CONFIG.xml --numberOfEvents 1000 --enableGun --gun.thetaMin 'pi/4' --gun.thetaMax '3*pi/4' --gun.distribution uniform --gun.phiMin '0*deg' --gun.phiMax '360*deg' --gun.energy '1*GeV' --gun.particle 'e-' --outputFile sim.edm4hep.root
JANA_PLUGIN_PATH=$CMAKE_INSTALL_PREFIX/lib/EICrecon/plugins LD_LIBRARY_PATH=$PWD/prefix/lib:$LD_LIBRARY_PATH $CMAKE_INSTALL_PREFIX/bin/eicrecon sim.edm4hep.root -Ppodio:output_file=reco.edm4eic.root -Ppodio:output_collections=CentralCKFTracksUnfiltered

This reveals some issues with CMake setup:

1. Additional helix utility library is redundant. The current the header-only library already exposes the include paths to helix_utils.h, but the translation units from helix_util.cc are only included in the helix_utils lib.
2. helix_utils is compiled as static by default which will not work as is. Would you consider making functionality header-only? It can be made shared too, but thats a lesser option in some ways.