379 implement ide model with age resolution

[hatrit]

Changes and Information

Please briefly list the changes (main added features, changed items, or corrected bugs) made:

• Added The Possibility to use Age Groups in the IDE SECIR Model
• m_transitions is still a Time Series but at each time step we now store a Vector auf size number Transitions * num_agegroups.
• In order to find the right Index in this Time series the function get_transition_flat_index was added.
• m_populationss is still a Time Series but at each time step we now store a Vector auf size number Infection States * num_agegroups.
• In order to find the right Index in this Time series the function get_state_flat_index was added.
• m_N, m_forceofinfection, m_total_confirmed_cases are now vectors of size num_agegroups.
• TransitionDistributions, TransitionProbabilities, TransmissionProbabilityOnContact, RelativeTransmissionNoSymptoms, RiskOfInfectionFromSymptomatic are now Custom Index Array.
• In model.cpp we compute the Transtions and Compartments for each Age Group separately. The compution of the force_of_infection was slightly changed.
• Added an Example using two Age Groups.
• The test ide_secir.cpp still tests the same things as before and uses only one Age Group.
• Added The Test File test_ide_secir_ageres.cpp where a Test to Compare with Previous run is implemented
• Changed The Test File test_ide_secir_parameters_io.cpp. We now use the data from cases_all_age_ma7.json, therefore we are using 6 Age Groups.

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Checks by code author

• [x] Every addressed issue is linked (use the "Closes #ISSUE" keyword below)
• [x] New code adheres to coding guidelines
• [x] No large data files have been added (files should in sum not exceed 100 KB, avoid PDFs, Word docs, etc.)
• [ ] Tests are added for new functionality and a local test run was successful (with and without OpenMP)
• [ ] Appropriate documentation for new functionality has been added (Doxygen in the code and Markdown files if necessary)
• [ ] Proper attention to licenses, especially no new third-party software with conflicting license has been added
• [ ] (For ABM development) Checked benchmark results and ran and posted a local test above from before and after development to ensure performance is monitored.

Checks by code reviewer(s)

• [ ] Corresponding issue(s) is/are linked and addressed
• [ ] Code is clean of development artifacts (no deactivated or commented code lines, no debugging printouts, etc.)
• [ ] Appropriate unit tests have been added, CI passes, code coverage and performance is acceptable (did not decrease)
• [ ] No large data files added in the whole history of commits(files should in sum not exceed 100 KB, avoid PDFs, Word docs, etc.)
• [ ] On merge, add 2-5 lines with the changes (main added features, changed items, or corrected bugs) to the merge-commit-message. This can be taken from the briefly-list-the-changes above (best case) or the separate commit messages (worst case).

Closes #379