Add sktime detector integration

[arnavk23]

• Adds an integration for tuning sktime detector / anomaly-detection estimators from Hyperactive.
• Provides an experiment adapter SktimeDetectorExperiment and a wrapper estimator TSDetectorOptCv so Hyperactive optimizers can tune sktime detectors with the same workflow used for classifiers/forecasters.
• Fixes [ENH] sktime detectors integration #197

[arnavk23]

@fkiraly @SimonBlanke please review this pr. Thanks!

[fkiraly]

Overall, this looks nice, but it feels like your are trying to import an evaluate function which does not exist, from sktime.

Currently there is no evaluate for detectors in sktime, so you may have to write it first there! Metrics and estimator API already exists, and imo it should be similar to forecasting. I would suggest you open an issue in sktime to add the evaluate method for detectors if it dtoes not exist, and add the routine there.

[fkiraly]

@arnavk23, can you describe how this is integrated with sktime, and whether a PR in sktime needs to be merged first?

[arnavk23]

@arnavk23, can you describe how this is integrated with sktime, and whether a PR in sktime needs to be merged first?

The mentioned PR in this pull request needs to merged first in sktime.

[fkiraly]

code quality checks are failing - please use pre-commit to fix the formatting issues

[arnavk23]

code quality checks are failing - please use pre-commit to fix the formatting issues

Made the changes. Please see.