ENH: add missing/improve annotated dictionaries

  New:
  - blockMeshDict
  - sampleDict
  - boxTurbDict
  - createBoxTurbDict
  - dsmcInitialiseDict
  - mdEquilibrationDict
  - mdInitialiseDict
  - obstaclesDict
  - optimisationDict
  - potentialDict
  - probesDict
  - sampleDict
  - setExprBoundaryFieldsDict
  - setExprFieldsDict

  Improved:
  - extrudeMeshDict
  - topoSetSourcesDict