Flow controller & misc

[maloel]

Need ability to use flow-controllers in DDS, to limit data rates. This is the prep work, including everything but the actual creation and usage of the flow-controllers (pending changes from eProsima):

• changed dds_topic_writer, dds_topic_reader, and dds_participant qos overrides
• change DDS serialization to use the above, with participant QoS indenting output (see example at bottom)
• fix some pyrealdds issues
• update topic-send and add topic-sink utilities

Plus some misc stuff:

• change make_less_screamy use a more generic algorithm word_format that can do generic dash_case conversions
• add rsutils::ios namespace for ios manipulations
• add ios::field and ios::indent, to make structure output to stream more standardized
• add docs for format_conversion, per Nir's request
• add missing docs for recommended-filters in stream-options

Serialization looks like this:

 12/05 12:53:38,638 DEBUG [5844] (dds-participant.cpp:255) participant 0568c81754a6.0.1c1 'realsense-viewer'
    transport
        udp
            max-initial-peers-range 4
            max-message-size 65500
        use-builtin-transports 0*
        listen-socket-buffer-size 0
        send-socket-buffer-size 0
    wire-protocol
        participant-id -1
        prefix 000000000000000000000000
        builtin
            discovery-config
                lease-duration 10.0*
is up on domain 0 from settings: {
    "-domain": 0,
    "-lease-duration": 15,
    "-participant-id": 23,
    "device": {
        "metadata": {
            "-reliability": "best-effort"
        }
    },
    "udp": {
        "-whitelist": [
            "192.168.11.2"
        ]
    }
}

[OhadMeir]

Not used

[maloel]

Removed.

[OhadMeir]

The separator/value notation is not that clear. Maybe use key/value or name/value notation