infra: Potential leak of memory in conversion.cpp

[battlmonstr]

conversion.cpp uses a bunch of naked new which is not exception-safe and results in the clang-tidy warnings of type clang-analyzer-cplusplus.NewDelete and clang-analyzer-cplusplus.NewDeleteLeaks

Those could be rewritten with unique_ptr and release().

[vlnistor]

Hey, I'm looking for a good first issue. Can I be assigned to this

[battlmonstr]

@vlnistor 🤝

[claudioutt]

Is this still open? Also looking for a good first issue.

[battlmonstr]

fixed by #1600