[clang] [analyzer] Conversion to CheckerFamily: MallocChecker (PR #147080)

[Donát Nagy via cfe-commits]

NagyDonat wrote:

@gamesh411 I applied all the changes that we discussed in the interactive review. Please accept the PR formally (or add any suggestions that you realized since then).

I'll probably merge this PR on 9th of July if there is no other feedback.

https://github.com/llvm/llvm-project/pull/147080