* Add MqttTopicTemplate
The topic template class is a way to deal with dynamic topics that
is less cumbersome and error-prone than String.Format or
other string fu one might use to handle dynamic topics.
Example:
MyCity/{street}/{crossing}/lights
'street' and 'crossing' would be parameters.
The class and its extension methods are intended to support
dynamic subscription/publication, message-topic matching and
routing. The template syntax is modelled after the well-known
moustache syntax, which conincidentally is also published
as the 'AsyncAPI channel address expressions'.
* Add MQTTnet.Extensions.TopicTemplate to solution
* Apply code style from team shared resharper settings.
Add missing file headers.
* Update release notes
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Co-authored-by: christian <6939810+chkr1011@users.noreply.github.com>
simonthum
