Wrong syntax of Bitrate values

Issue

• The problem is that in many parts of the code, but also in the documentation, we define bitrate for AMBR as follows: 100Mbps
• If we strictly follow 3GPP TS 29.571 BitRate regex, this is not okay: ^\d+(\.\d+)? (bps|Kbps|Mbps|Gbps|Tbps)$

This means that we need a mandatory space between the number and the unit, so e.g. 100 Mbps. We do that in the SQL files as well as in the SMF config. In the new QoS development, I have made the code more lenient to accept it with and without space.

@tien-thinh.nguyen @defosseu @arora Any thoughts on that? I propose that we change it everywhere to the correct ones but that we still accept the value without the space.