[RF] Skip out-of-range events in RDataFrame to RooDataSet Helper

[guitargeek]

The RDataFrameHelper should be consistent with creating a RooDataSet
from a TTree, meaning out-of-range events should be skipped. This is
implemented in this commit, borrowing the logic from
RooTreeDataStore::loadValues(). A unit test is also implemented.

The previous logic of just taking just all values to fill the dataset
was very dangerous, because these values then clipped to the RooRealVar
limits and biased the number of events observed at the boundaries.

Closes #11017.

[phsft-bot]

Starting build on ROOT-debian10-i386/soversion, ROOT-performance-centos8-multicore/cxx17, ROOT-ubuntu18.04/nortcxxmod, ROOT-ubuntu2004/python3, mac1015/cxx17, mac11/cxx14, windows10/cxx14
How to customize builds

[phsft-bot]

Build failed on ROOT-debian10-i386/soversion.
Running on pcepsft10.dyndns.cern.ch:/build/workspace/root-pullrequests-build
See console output.

Failing tests:

• projectroot.roofit.roofitcore.test.gtest_roofit_roofitcore_test_testRooCategory
• projectroot.roofit.roofitcore.test.gtest_roofit_roofitcore_test_testRooAbsReal
• projectroot.roottest.root.roofitstats.gtesttest_root_roofitstats_stabilityTests

[phsft-bot]

Build failed on ROOT-ubuntu18.04/nortcxxmod.
Running on sft-ubuntu-1804-2.cern.ch:/build/workspace/root-pullrequests-build
See console output.

Failing tests:

• projectroot.tmva.tmva.test.gtest_tmva_tmva_test_rreader
• projectroot.roofit.roofitcore.test.gtest_roofit_roofitcore_test_testRooCategory
• projectroot.roofit.roofitcore.test.gtest_roofit_roofitcore_test_testRooAbsReal
• projectroot.roottest.root.roofitstats.gtesttest_root_roofitstats_stabilityTests

[phsft-bot]

Build failed on ROOT-performance-centos8-multicore/cxx17.
Running on olbdw-01.cern.ch:/data/sftnight/workspace/root-pullrequests-build
See console output.

Failing tests:

• projectroot.runtutorials.tutorial_roofit_rf401_importttreethx
• projectroot.runtutorials.tutorial_roofit_rf401_importttreethx_py
• projectroot.roofit.roofitcore.test.gtest_roofit_roofitcore_test_testRooAbsReal
• projectroot.roofit.roofitcore.test.gtest_roofit_roofitcore_test_testRooCategory
• projectroot.roottest.root.roofitstats.gtesttest_root_roofitstats_stabilityTests

[phsft-bot]

Build failed on ROOT-ubuntu2004/python3.
Running on root-ubuntu-2004-1.cern.ch:/home/sftnight/build/workspace/root-pullrequests-build
See console output.

Failing tests:

• projectroot.roofit.roofitcore.test.gtest_roofit_roofitcore_test_testRooCategory
• projectroot.roofit.roofitcore.test.gtest_roofit_roofitcore_test_testRooAbsReal
• projectroot.roottest.root.roofitstats.gtesttest_root_roofitstats_stabilityTests

[phsft-bot]

Build failed on windows10/cxx14.
Running on null:C:\build\workspace\root-pullrequests-build
See console output.

Failing tests:

• projectroot.roottest.root.meta.MakeProject.roottest_root_meta_MakeProject_stl_makeproject_test_build
• projectroot.roottest.root.meta.MakeProject.roottest_root_meta_MakeProject_examples
• projectroot.roottest.root.meta.MakeProject.roottest_root_meta_MakeProject_stltest
• projectroot.roottest.root.meta.MakeProject.roottest_root_meta_MakeProject_stltest2
• projectroot.roofit.roofitcore.test.gtest_roofit_roofitcore_test_testRooCategory
• projectroot.roofit.roofitcore.test.gtest_roofit_roofitcore_test_testRooAbsReal
• projectroot.roottest.root.roofitstats.gtesttest_root_roofitstats_stabilityTests

[phsft-bot]

Starting build on ROOT-debian10-i386/soversion, ROOT-performance-centos8-multicore/cxx17, ROOT-ubuntu18.04/nortcxxmod, ROOT-ubuntu2004/python3, mac1015/cxx17, mac11/cxx14, windows10/cxx14
How to customize builds

[phsft-bot]

Build failed on ROOT-performance-centos8-multicore/cxx17.
Running on olbdw-01.cern.ch:/data/sftnight/workspace/root-pullrequests-build
See console output.

Failing tests:

• projectroot.runtutorials.tutorial_tmva_TMVAClassification
• projectroot.runtutorials.tutorial_v7_global_temperatures.cxx
• projectroot.roottest.root.multicore.roottest_root_multicore_processExecutorH1Test

[phsft-bot]

Build failed on mac11/cxx14.
Running on macphsft20.dyndns.cern.ch:/Users/sftnight/build/workspace/root-pullrequests-build
See console output.

Failing tests:

• projectroot.roottest.python.distrdf.dask.roottest_python_distrdf_dask_test_all
• projectroot.runtutorials.tutorial_multicore_mp103_processSelector

[phsft-bot]

Build failed on mac1015/cxx17.
Running on macitois21.dyndns.cern.ch:/Users/sftnight/build/workspace/root-pullrequests-build
See console output.

Failing tests:

• projectroot.tree.dataframe.test.gtest_tree_dataframe_test_datasource_csv

[lmoneta]

LGTM !
Thank you for the fix!