Prototype for reader-driver ability to skim MC input from files

[shahor02]

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[alibuild]

Error while checking build/O2/fullCI for 5fde5ce at 2024-09-17 00:27:

## sw/BUILD/O2-latest/log
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
input_line_9:666:19: error: cannot initialize a member subobject of type 'uint64_t' with an rvalue of type 'int'
input_line_9:677:33: error: use of undeclared identifier 'v'
Error: /sw/slc8_x86-64/ROOT/v6-32-02-alice1-14/bin/rootcling: compilation failure (/sw/BUILD/5cd25df61fd828b752aba0148a6641b2d8601c8d/O2/DataFormats/common/G__O2CommonDataFormatf158a36938_dictUmbrella.h)
ninja: build stopped: subcommand failed.

Full log here.

[shahor02]

@sawenzel
Here is the prototype for MC skimming. At the moment I've adapted only ITS/MFT digit reader.
To test it: for any existing anchored MC with digits preserved:

1. generate a file with IRFrames (pares of InteractionRecord objects to select).
   I've added a sample macro https://github.com/AliceO2Group/AliceO2/blob/83bcdf531467a213cf2890bafe287c7335b4edf2/macro/CreateSampleIRFrames.C which takes as arguments the offset wrt TF to start (e.g. if we want to skip 1st orbit), the frame duration and the gap to the next frame (all in BC). It will generate a file irframes.root.
2. to run any workflow that fetches data from root file readers one should precede it with
   o2-reader-driver-workflow passing the options as below:

DIGINP="--hbfutils-config o2simdigitizerworkflow_configuration.ini,irframes.root,upstream"
# throttling is optional but useful
TFTHROTTLE="--timeframes-rate-limit 2 --timeframes-rate-limit-ipcid 1 "

o2-reader-driver-workflow $DIGINP $TFTHROTTLE | o2-its-reco-workflow  $DIGINP $TFTHROTTLE --trackerCA 

This will force the ITS reader created by the its-reco to extract from the single digitized TF only ROFs corresponding to each of the defined IRFrames and send them as separate TFs. If there are multiple IRFrames selected for a given TF, in the DPL header they will have the same tfCounter and firstTFOrbit but incremented timeslices.

At the moment I could not find a proper solution for the following:
to know how much data the reader should fetch, it has to read some CCDB objects.
But I cannot simply add a ccdbParamSpec since it will work in the old standalone reader mode (upstream CCDB fetcher will not have timing input).
In principle, one can add a dedicated option to the reader spec to request such a ccdbspec but at the moment I am reading the needed object via CCDBManager:

AliceO2/Detectors/ITSMFT/common/workflow/src/DigitReaderSpec.cxx

Lines 75 to 89 in 83bcdf5

	auto& ccdb = o2::ccdb::BasicCCDBManager::instance();
	auto rlim = ccdb.getRunDuration(tinfo.runNumber);
	long ts = (rlim.first + rlim.second) / 2;
	if (mOrigin == o2::header::gDataOriginITS) {
	ccdb.getForTimeStamp<o2::itsmft::DPLAlpideParam<o2::detectors::DetID::ITS>>("ITS/Config/AlpideParam", ts);
	const auto& alpideParam = o2::itsmft::DPLAlpideParam<o2::detectors::DetID::ITS>::Instance();
	mROFBiasInBC = alpideParam.roFrameBiasInBC;
	mROFLengthInBC = alpideParam.roFrameLengthInBC;
	mNRUs = o2::itsmft::ChipMappingITS::getNRUs();
	} else {
	ccdb.getForTimeStamp<o2::itsmft::DPLAlpideParam<o2::detectors::DetID::MFT>>("MFT/Config/AlpideParam", ts);
	const auto& alpideParam = o2::itsmft::DPLAlpideParam<o2::detectors::DetID::MFT>::Instance();
	mROFBiasInBC = alpideParam.roFrameBiasInBC;
	mROFLengthInBC = alpideParam.roFrameLengthInBC;
	mNRUs = o2::itsmft::ChipMappingMFT::getNRUs();

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