ENH: add new FO Streaming-Total Dynamic Mode Decomposition (STDMD)

    STDMD (i.e. Streaming Total Dynamic Mode Decomposition) is a variant of
    a data-driven dimensionality reduction method.

    STDMD is being used as a mathematical post-processing tool to compute
    a set of dominant modes out of a given flow (or dataset) each of which is
    associated with a constant frequency and decay rate, so that dynamic
    features of a given flow may become interpretable, and tractable.
    Among other Dynamic Mode Decomposition (DMD) variants, STDMD is presumed
    to provide the general DMD method capabilities alongside economised and
    feasible memory and CPU usage.

    Please refer to the header file documentation for further details.

  ENH: add new STDMD tutorial, pimpleFoam/laminar/cylinder2D