Add cli option to limit the code generation to specific tags or paths

[ctot-nondef]

as some swagger definitions are quite large, the resulting API-clients can be very large and as such hard to handle by IDEs/language servers. the autocomplete for types turns laggy.

as in many scenarios only a specific set of operations is actually used, it would be great if there was a cli-option to select the operations needed either by passing a (list of) tag(s) or by passing a (list of) operationId(s) like so:

Options:
  --operationIds <operationId1,operationId2>               A comma separated list of operationIds the client generation will be limited to
  --tags <tag1,tag2>                                       A comma separated list of tags the client generation will be limited to