Update docs about semantic_components

[christophfroehlich]

We have an (outdated) list of semantic components here:
https://control.ros.org/rolling/doc/ros2_control/hardware_interface/doc/hardware_interface_types_userdoc.html#sensors
Where should we put this in the docs (can be a follow-up PR)?

Originally posted by @christophfroehlich in #1945 (review)

[christophfroehlich]

@tpoignonec what do you think?

[tpoignonec]

What about adding a subsection in guidelines and best practices?

Example text:

#Hardware Components
##Guidelines and Best Practices
###Using semantic components

In order to streamline the configuration of commonly used hardware interface, so-called semantic components can be used to wrap mechanisms to claim / release the interfaces. The base components semantic_components::SemanticComponentInterface and semantic_components::SemanticComponentCommandInterface are used to define semantic components for read-only and write only devices, respectively.

List of existing SemanticComponentInterface and associated broadcaster, if any:

• IMUSensor, used by Imu Sensor Broadcaster
• ForceTorqueSensor, used by Force Torque Sensor Broadcaster
• GPSSensor
• PoseSensor
• RangeSensor

List of existing SemanticComponentCommandInterface and associated controller, if any:

• LedRgbDevice

Location in docs:

[christophfroehlich]

Looks fine, I've created a PR #2032 with your proposal.