Remove boost::phoenix and migrate from boost::spirit::qi to boost::spirit::x3

[mugr1x]

Related #6551
I know @SiarheiFedartsou mentioned elsewhere it's not good style in general to use both boost::optional and std::optional in the same codebase. The removal is delayed due to spirit::qi and phoenix incompatiblity with std::optional. This would involve adpapting the current parsers (3 ones) completely new in x3, but I do have some progress in my fork.
Also for removing phoenix as per docs "Define small unnamed function objects at the actual call site" seems like something one would want to remove for a cleaner codebase and I can see it only being used in conjunction with qi so migrating to x3 would make it obsolete.

[mugr1x]

Also I should probably mention I applied for GSoC 2023 (;
Indeed this one: #6558