TransientProblemInterface is using delegates

[andrsd]

• TSMonitor is now implemented as a delegate
• TransientProblemInterface: pre/post step is is done via static function
• TransientProblemInterface: compute_rhs is a delegate
• TransientProblemInterface: changing some virtual into normal methods
• TransientProblemInterface: moving compute_ifunction_local from ImplicitFENonlinearProblem
• TransientProblemInterface: moving compute_ijacobian_local from ImplicitFENonlinearProblem
• TransientProblemInterface: moving compute_boundary_local from ImplicitFENonlinearProblem

[codecov]

Codecov Report

Attention: Patch coverage is 97.41379% with 3 lines in your changes missing coverage. Please review.

Project coverage is 88.51%. Comparing base (1a92b1c) to head (4aa8314).

Files	Patch %	Lines
src/TransientProblemInterface.cpp	94.73%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #540      +/-   ##
==========================================
+ Coverage   88.45%   88.51%   +0.06%     
==========================================
  Files         186      187       +1     
  Lines       11013    11081      +68     
==========================================
+ Hits         9741     9808      +67     
- Misses       1272     1273       +1     

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