[tune] Refactor search algorithms (#7037)

* start refactoring of search algorithms

* format

* needs tests

* fix

* suggestions

* Fix PBT

* lint

* refactoring

* hyperopt_working

* dragonfly

* hyperopt

* change_half_of_algs

* save

* code-removed

* remove_lots_of_unneccessary

* changes

* formatting

* suggest

* reset

* rm

* tests

* search-change

* exception

* refactor-doc

* search

* py

* moredocs

* Update doc/source/tune-searchalg.rst

* concurrency

* max

* tune

* betterwarning

* bohb

* tests

* test-change

Co-authored-by: ujvl <misraujval@gmail.com>

python/ray/tune/examples/zoopt_example.py

@@ -51,7 +51,6 @@ if __name__ == "__main__":
         algo="Asracos",  # only support ASRacos currently
         budget=config["num_samples"],
         dim_dict=dim_dict,
-        max_concurrent=4,
         metric="mean_loss",
         mode="min")