feat: release version 2.3.0 (asyncapi#681) 

fix: deprecate `$ref` property in Channel Item Object 

feat: allow servers and channels to be defined as components 

feat: add Solace bindings to the list of supported bindings in the spec. 

feat: release 2.2.0 spec version (asyncapi#633) Co-authored-by: Gerald Loeffler <gerald.loeffler@googlemail.com> Co-authored-by: Vladimir Gorej <vladimir.gorej@gmail.com> Co-authored-by: Maciej Urbańczyk <urbanczyk.maciej.95@gmail.com>

feat: assign channels to servers (asyncapi#531) 

feat: update points from 2.1.0 version to 2.2.0 (asyncapi#629) 

fix: unify Message and MessageTrait examples description (asyncapi#608) 

feat: add Anypoint MQ protocol to list of supported bindings (asyncap… …i#545)

feat: release 2.1.0 version of the spec (asyncapi#575) Co-authored-by: Dale Lane <dale.lane@gmail.com> Co-authored-by: Maciej Urbańczyk <urbanczyk.maciej.95@gmail.com> Co-authored-by: Laurent Broudoux <laurent.broudoux@gmail.com> Co-authored-by: nictownsend <nictownsend@uk.ibm.com>