ENH: extend GeoMesh interface, prepare for in-place patch slices

• base preparatory changes for field slicing etc.

changed milestone to %v2506

added enhancement label

assigned to @Mattijs

added 5 commits

• 7b83071a...c78f2503 - 2 commits from branch develop
• 4668d0e8 - ENH: extend GeoMesh interface to include boundary_size() static method
• a9b59ad2 - ENH: control local boundary consistency checks from FieldBase settings
• 72ce3eb4 - BREAKING: change in behaviour for faPatch/fvPatch patchInternalField()

Compare with previous version

mentioned in commit 6ca0c595

merged