Pipe dreams: Add support for (named) file descriptor: jau::fs::file_stat and jau::io::ByteInStream_File, ...

as well as considering file_stat::is_fd() in
- jau::fs::remove(): Deletion not allowed

jau::io::ByteInStream_File:
- If source path denotes a named file descriptor, i.e. jau::fs::file_stats::is_fd() returns true,
  has_content_size() returns false and check_available() returns true as long the stream is open and EOS hasn't occurred.

Note: file_stat::is_fd() and file_stat::is_file() are orthogonal.

+++

This work is covered to allow stream-processing via pipes (e.g. stdin/stdout).
Current use-case is cipherpack's encryption/decryption streaming.

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