build(bindings/cpp): fetch and build dependencies instead of finding system libs #5188
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Which issue does this PR close?
Closes #5187.
Rationale for this change
Currently C++ binding uses find_package to locate system-wide libraries like GTest and Boost.
We can replace them by FetchContent to fetch them online and build them by needs (just like cargo) instead of using system libraries (which we cannot control versions and optional features.)
What changes are included in this PR?
Are there any user-facing changes?
None.