[analyzer] Refactor MallocChecker to use `BindExpr` in `evalCall` (#106081)
PR refactors `MallocChecker` to not violate invariant of `BindExpr`,
which should be called only during `evalCall` to avoid conflicts.
To achieve this, most of `postCall` logic was moved to `evalCall` with
addition return value binding in case of processing of allocation
functions. Check functions prototypes was changed to use `State` with
bound return value.
`checkDelim` logic was left in `postCall` to avoid conflicts with
`StreamChecker` which also evaluates `getline` and friends.
PR also introduces breaking change in the unlikely case when the
definition of an allocation function (e.g. `malloc()`) is visible: now
checker does not try to inline allocation functions and assumes their
initial semantics.
Closes #73830