Replace boost::optional with std::optional

Dmitri Naumovrequested to merge
endJunction/ogs:ReplaceBoostOptional into master

Consistently using std::optional through all of the ogs code. The only place (I'm aware of) where boost::optional is used is the ConfigTree; there an explicit conversion to std::optional happens.

  1. Feature description was added to the changelog
  2. Tests covering your feature were added?
  3. Any new feature or behavior change was documented?
Edited by Dmitri Naumov

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