samples: add samples for encryption enforcement config feature

[nidhiii-27]

Added samples:
storage_get_encryption_enforcement_config
storage_remove_encryption_enforcement_config
storage_set_encryption_enforcement_config

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• samples/snippets/src/main/java/com/example/storage/bucket/GetEncryptionEnforcementConfig.java:19, tag storage_get_encryption_enforcement_config
• samples/snippets/src/main/java/com/example/storage/bucket/RemoveAllEncryptionEnforcementConfig.java:19, tag storage_remove_all_encryption_enforcement_config
• samples/snippets/src/main/java/com/example/storage/bucket/SetBucketEncryptionEnforcementConfig.java:19, tag storage_set_encryption_enforcement_config

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[soumyaagrawal-g]

can we repuspose this class to be more generic like to "Update" EncryptionEnforcementConfig instead?
This way may be we can have samples for :

1. remove a specific encryption enforcement (maybe taking in encryption-type as input: gmek, cmek, csek)?
2. remove all encryption enforcement all together.
3. update a specific encryption types' restriction mode?
   wdyt?

[nidhiii-27]

But we are already updating and doing this in the three different examples in SetBucketEncryptionEnforcementConfig
and if a specific case is needed, we can add it there

[soumyaagrawal-g]

isn't SetBucketEncryptionEnforcementConfig for "bucket create, along with encryption-enforcement config",
while UpdateBucketEncryptionEnforcementConfig would be for all kinds of "bucket update, related to encryption-enforcement config"?