[Helper] Deprecate error-prone resize and add emplace_back

[alxbilger]

resize(Size s, bool) is error-prone because of a similar function in std::vector but with different behavior: resize(size_type count, const value_type& value). See https://en.cppreference.com/w/cpp/container/vector/resize

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[alxbilger]

[ci-build][with-all-tests]

[damienmarchal]

Looks good to me and, one more time a very meaningful change.

[alxbilger]

[ci-build][with-all-tests]