[clang] [clang][analyzer] Support 'fdopen' in the StreamChecker (PR #76776)

[Balázs Kéri via cfe-commits]

balazske wrote:

One note that should be added to the documentation:
The `StreamChecker` does not handle file descriptors associated to streams. Therefore some issues can appear, for example `fileno` does not return the value that was used to open a stream with `fdopen`, and the standard streams do not work accurately with this checker.

https://github.com/llvm/llvm-project/pull/76776