Add support for --sse, --sse-kms-key-id flags under a feature flag

[vladem]

Description of change

1. Pass --sse, --sse-kms-key-id to the S3CrtClient (changes are added under a compile-time feature flag);
2. Add happy test to fuse_tests/write_test.rs that uses IAM session policies;
3. Add error tests to fuse_tests/fork_test.rs that check error logs.

Thinking of adding the checksumming logic in a separate PR.

Relevant issues: #534

Does this change impact existing behavior?

This is not a breaking change.

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