`secretsmanager:DescribeSecret` returns `VersionIdsToStages`
`secretsmanager:ListSecrets` returns the same information in `SecretVersionsToStages`
* Verified fix against real AWS backend.
Fixes#3406
* Feature: Support --filters opton in secretsmanager:ListSecrets
* Implement some of the secret filters
* Check listSecrets filters combine with an implicit AND operator
* Test all filter and multi-value filter and multi-word filter
* Fix matcher behavior, restructure code
* Implement remaining listSecrets filter cases
* Linter fixes
* Use contains-in-any-order assertions for test_list_secrets
* Linter fix again
* Attempt Python 2 fix for assert_items_equal
* Remove docstrings from test_list_secrets tests as they make the test reports weird
* Test and handle listSecrets filter with no values
