Convergence management tracking

[maniospas]

IImplement a high-level way of summarizing convergence analysis, for example to help measure running time and iterations when algorithms are wrapped by postprocessors (including iterative schemes).
For example, a list of all convergence manager run outcomes could be obtained. Perhaps this could be achieved with some combination of dependent algorithm discovery and keeping convergence manager history on restart.

Related tests: tests.test_filters.test_convergence_string_conversion