Pykusto

1. New feature: perform retries upon transient failures.
1. Bug fix: stop suppressing exceptions raised while fetching in background.

Bug fix

1. Modify fetching behavior to avoid confusing behavior if items are requested before they are done being fetched
1. Add methods 'not_in' and 'has_not'
1. Add 'mod' parameter to hash function
1. Add 'case_sensitive' parameter to 'is_in' method
1. Fix 'is_in' method for non-litral arrays: now uses 'set_has_element' instead of 'contains'
1. Add reference to base practices in documentation
1. Reduce code duplication in tests

Breaking changes
1. Import style changed to not specify submodules. E.g. `from pykusto import PyKustoClient` instead of `from pykusto.client import PyKustoClient`
2. Internal facing classes were moved under `_src` to avoid being imported.
3. `has_cs` function deleted, instead use `has` with `True` as the second argument.
Other changes
1. A convenient list of all externally-facing classes as the autocomplete of `from pykusto import `

1. Add functions: `all_of`, `any_of`.
2. Allow providing multiple predicates to `where` (87)
3. Fix logic for testing containment in dynamic types (96)
4. Prevent accidental use of logical operators (97)

1. Add `pretty_render` method
1. Allow adding a table name to a floating query