add bucket authentication for server side encryption algorithm

[nadavMiz]

Explain the changes

expend bucket policy to enable statements containing conditions for authenticating based on server side encryption algorithm. providing base for farther adding other condition statements. enabling deny, accept bucket policies for stringEquals StringNotEquals and null conditions for server side encryptions

Testing Instructions:

1. ceph s3 test: s3tests_boto3.functional.test_s3:test_bucket_policy_put_obj_s3_noenc

[jackyalbo]

We should add unit tests to cover these changes in test_s3_bucket_policy. Please add.

[nadavMiz]

We should add unit tests to cover these changes in test_s3_bucket_policy. Please add.

I have added unit tests. also I have noticed I didn't handle returning the condition values to their original values in get _bucket_policy, so I have added that, and unit test for it

[liranmauda]

We should think if this is actually required.
@dannyzaken WDYT?

I don't think that we should add bucket authentication for server-side encryption algorithm In a PR just for fixing a ceph test.

As @dannyzaken and I suggested before, this feels too big of a change as it is touching the authentication, and we should do it as a feature and not partially as part of a ceph test.

I think that we should close this PR.

@nimrod-becker @dannyzaken @jackyalbo WDYT?

.