Add support for restoring SSE-C encrypted objects

[krisis]

Description

mc ilm restore fails to restore transitioned objects if they were encrypted on the client-side using SSE-C encryption. While the object is actually restored in the backend, mc is unable to report its restore status because it can't decrypt the object's metadata on SSE-C. To fix this, this PR adds --encrypt-key flag to ilm-restore command similar to other commands like cp, stat, ....
Fixes minio/minio#16471

Motivation and Context

See minio/minio#16471

How to test this PR?

See minio/minio#16471

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Optimization (provides speedup with no functional changes)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• Fixes a regression (If yes, please add commit-id or PR # here)
• Unit tests added/updated
• Internal documentation updated
• Create a documentation update request here