[ENH] add model checkpoint to inceptionTime deep classifier

[hadifawaz1999]

Part of #321
to see if it works fine, if yes than I should add the removal of the file saved.
Even if the tests get checked, this should get in before the addition of the removal of the saved model using os.remove

[hadifawaz1999]

This should be ready now to get in.

[TonyBagnall]

Have you removed it from excluded list?

[hadifawaz1999]

@TonyBagnall which test do we exclude, the test_save_estimators_to_file only or the test_persistence_via_pickle as well ?

[hadifawaz1999]

@TonyBagnall @MatthewMiddlehurst it ended up generating the same long int :) and so I went back the older naming technique, hoping that this technique has more randomness in it

[MatthewMiddlehurst]

We should probably import time at the top of the file but I'm not gonna make this rerun CI for that.

[hadifawaz1999]

Yeah @MatthewMiddlehurst i can keep it in mind for the next PR that includes deep learning models