[libc][realpath] Implement symbolic path resolution (#204467) This PR contains an incremental implementation of `realpath` that just simplifies path traversals (e.g. `"/a/./../b"` -> `"/b"`). The complete implementation would perform `getcwd`/`statx`/`readlinkat` to actually resolve symlinks, validate paths, etc. This PR aims to add as much functionality/error handling as possible without making any syscalls. This implementation lives in `libc/src/stdlib/linux/`, since follow-on PRs will rely on linux-specific syscalls. For testing purposes, I've added the entrypoint for x86-64 linux when `LLVM_LIBC_ENABLE_EXPERIMENTAL_ENTRYPOINTS` is enabled. Follow-on PRs to add: path validation (e.g. paths must exist), support for cwd-relative paths, and symlink resolution.
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