Add frequency anomalies and a few fixes

algorithm_params.json

config_maker/anomalies/__init__.py

config_maker/dimensions/correlation.py

config_maker/dimensions/oscillating.py

config_maker/dimensions/varying_frequency.py

config_maker/generator.py

generator/anomaly/__init__.py

generator/anomaly/noise.py

generator/dataset.py

generator/dimension/linear_correlation.py

generator/dimension/oscillating.py

generator/dimension/varying_frequency.py

main.py

split/base.py

trainers/base.py