Feature: Secrets Manager put_secret_value and list_secret_version_ids (#2116)

* initial work

- adding put_secret_value and list_secret_versions

* Added support for versions in all functions except rotate_secret

* more work

- refactor rotate_secret method
  - now, adds a new version of the secret and points default version id to it
- updated implementation coverage readme
- element in list check to fix unit test
- fixed linting errors
- added tests, fixed exception, failing tests still
- secrets_manager/test_server fails when running whole suite,
  but not when running that individual test file

* fixed failing test_get_secret_value

* Removed test.py. Fixed condition statement.

* fixed default stages + adding AWSPREVIOUS

* remove old AWSPREVIOUS stages

moto/secretsmanager/exceptions.py

@@ -29,6 +29,14 @@ class InvalidParameterException(SecretsManagerClientError):
             message)
 
 
+class ResourceExistsException(SecretsManagerClientError):
+    def __init__(self, message):
+        super(ResourceExistsException, self).__init__(
+            'ResourceExistsException',
+            message
+        )
+
+
 class InvalidRequestException(SecretsManagerClientError):
     def __init__(self, message):
         super(InvalidRequestException, self).__init__(