- runtime reconfiguration
- <image>.<transport>.<param> as future replacement of  <image>.<param>
  - e.g. `image.compressedDepth.png_level` instead of `image.png_level`
- support both ways for now
- emit deprecation warnings on setting through non-transport scoped parameter
- synchronize deprecated changes to new ones
  - this is necessary for dynamic reconfigure
- add ROS1 like ranges for parameters (min/max)
- some cleanup
  - remove unnecessary includes, using statements, etc.

Default png_level was left the same as for compressed_image_transport
- this is OpenCV default (3)
- the deprecated paramterer name clashes here with compressed_image_transport
- I don't really want to consider if there is a race between plugin loading for default value
- side notes:
  - in ROS2 default was 9
    - 9 is not usable for real-time processing on most machines
  - in ROS1 default is now 1
  - 3 is typically usable for real-time processing
  - this should probably be made even with ROS1 after removing deprecated parameters

Related to ros-perception#140
Builds up on ros-perception#110

Co-authored-by: Kenji Brameld <[email protected]>

Co-authored-by: Kenji Brameld <[email protected]>

Co-authored-by: Kenji Brameld <[email protected]>

For:
- compressed_depth_image_transport
- compressed_image_transport

For already declared attributes those reads do nothing

Requested in ros-perception#145