Deprecate remaining VI methods (#5806)

* Deprecated remaining VI methods

* Deleted flows and code for local and batched kwarg

* removed rowwise from opvi.py

* redo the test_variational_inference.py

* refactored some test cases

* removed mention of local from docstring

* refactor some test in varialional_inference

* did correction in docstring

* removed batched dimension property

* added symbolic_random

* removed part = 'total'

* refactor test_logq_globals and test_pickle_approx test

* refactor test_init_groups

Author: purna135