Compatibility with upcoming paradox CRAN release

[mb706]

Description

Use version-agnostic paradox UI to prepare for new CRAN release: Instead of ParamDbl, ParamInt objects, create ParamSets using ps(param_id = p_int(...)).

Reference to Issues or PRs

#194

Comments

CI checks that use the 'dev' version of mlr3 now also use the dev-version of paradox; you can choose to remove this once paradox 1.0.0 is on CRAN.

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[PhilippBach]

I'm merging this PR now for some additional checks to p-paradox... I'll close the issue once the changes are merged to main... Thanks for your help so far!