Allow for meta directives

Description of the current situation

Since I got such quick feedback on my bug report ...

I was wondering if any progress had been made on https://tex.stackexchange.com/questions/458085/how-to-create-a-meta-directive-in-arara

Basically instead of having a preamble in .araraconfig.yaml like

preambles:
   mytikzimage: |
      % arara: clean: { extensions: [ aux, bbl, bcf, blg, out, run.xml ] }
      % arara: pdflatex: { options: [ '-halt-on-error' ], interaction: batchmode }
      % arara: biber: { options: [ '--validate_datamodel' ] }
      % arara: pdflatex: { options: [ '-halt-on-error' ], interaction: batchmode }
      % arara: --> until !found('log', 'Rerun to get cross-references right.')
      % arara: --> && !found('log', 'There were undefined references.')
      % arara: clean: { extensions: [ aux, bbl, bcf, blg, out, run.xml ] }

and calling arara -p mytikzimage test.tex I would rather be able to define a meta directive someplace and add the directive to test.tex like

% arara: meta: mytikzimage

and call arara test.tex. This would allow arara to be called from a single shortcut without having to worry about which preamble to use.