feat: support encryption for backup data

[zjx20]

This PR integrates data encryption functionality from datasafed. Backup data is encrypted before being written to storage. Currently, the supported encryption algorithms are AES-128-CFB, AES-192-CFB, and AES-256-CFB. In the future, additional algorithms can be supported based on requirements.

Usage instructions:

1. Create a Secret to store the encryption key:

   kubectl create secret generic backup-encryption \
     --from-literal=secretKey='your secret key'

2. Patch the backupPolicy to enable encryption. Reference the previously created key here:

   kubectl --type merge patch backuppolicy mysqlcluster-mysql-backup-policy \
     -p '{"spec":{"encryptionConfig":{"algorithm":"AES-256-CFB","passPhraseSecretKeyRef":{"name":"backup-encryption","key":"secretKey"}}}}'

3. Configuration is complete. Perform backups and restores as usual.

Note: The content of the Secret created in step one should not be modified or deleted; otherwise, decryption of backups will fail in the future.

Subsequent simplification of these operations can be achieved through kbcli.

Close #6722.

[codecov]

Codecov Report

Attention: Patch coverage is 42.10526% with 33 lines in your changes are missing coverage. Please review.

Project coverage is 66.40%. Comparing base (714cbb3) to head (ed5bf6c).
Report is 5 commits behind head on main.

Files	Patch %	Lines
pkg/dataprotection/utils/backuprepo.go	0.00%	19 Missing ⚠️
controllers/dataprotection/utils.go	57.89%	6 Missing and 2 partials ⚠️
controllers/dataprotection/backup_controller.go	75.00%	2 Missing and 1 partial ⚠️
pkg/dataprotection/restore/builder.go	33.33%	2 Missing ⚠️
pkg/dataprotection/backup/deleter.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6723      +/-   ##
==========================================
+ Coverage   66.35%   66.40%   +0.04%     
==========================================
  Files         305      305              
  Lines       36662    36715      +53     
==========================================
+ Hits        24326    24379      +53     
  Misses      10238    10238              
  Partials     2098     2098              

Flag	Coverage Δ
unittests	66.40% <42.10%> (+0.04%)	⬆️

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[ldming]

LGTM