Include Boost as CMake subproject

[Pansysk75]

Draft PR for properly fetching and installing boost as a CMake subproject.
Still needs fixes, but I paused working on it since we need boostorg/cmake#65 to move forward with this approach.

Can also move to using find_package Config mode, since Module mode (using Find<PackageName>.cmake) is being deprecated for Boost.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.10%	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (d08354d)	222123	188895	85.04%
Head commit (8d8b4e6)	191107 (-31016)	162713 (-26182)	85.14% (+0.10%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#6510)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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