mgr/cephadm: adding cephadm deploy-file command for mgr file writes

mgr/cephadm: adding cephadm deploy-file command for mgr file writes

Add a cephadm "deploy-file" subcommand that reads raw file bytes from stdin
and atomically installs them at an absolute destination (--fsid, --path,
optional --mode, --uid/--gid). Use it from the mgr for client conf/keyring
sync and tuned profiles instead of SSHManager.write_remote_file.
Keep staging the cephadm binary over SSH via _write_remote_file when sudo
hardening is off, the invoker deploy_binary path is unchanged when hardening
is on.
SSH: pass encoding=None to asyncssh conn.run when stdin is bytes so binary
payloads (deploy-file) are not UTF-8-encoded as str. Only add the input kwarg
when stdin is not None.

Fixes: https://tracker.ceph.com/issues/74045
Signed-off-by: Shweta Bhosale <Shweta.Bhosale1@ibm.com>