Support encrypted columns in Schema Loader

[brfrn169]

Description

This PR adds support for encrypted columns to Schema Loader. With this change, users can specify the ENCRYPTED flag in the column definition as follows:

{
  "sample_db.sample_table": {
    "partition-key": [
      "c1"
    ],
    "clustering-key": [
      "c4 ASC",
      "c6 DESC"
    ],
    "columns": {
      "c1": "INT",
      "c2": "TEXT ENCRYPTED",
      "c3": "BLOB",
      "c4": "INT",
      "c5": "BOOLEAN ENCRYPTED",
      "c6": "INT"
    }
  }
}

In the above example, the ENCRYPTED flag is specified for the c2 and c5 columns:

Related issues and/or PRs

• Add encrypted column concept #1907

Changes made

• Added support for encrypted columns to Schema Loader.

Checklist

• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation to reflect the changes.
• Any remaining open issues linked to this PR are documented and up-to-date (Jira, GitHub, etc.).
• Tests (unit, integration, etc.) have been added for the changes.
• My changes generate no new warnings.
• Any dependent changes in other PRs have been merged and published.

Additional notes (optional)

N/A

Release notes

Same as #1907

[brfrn169]

I forgot to add encryptedColumnNames to equals() and hashCode() in the previous PR...

[Torch3333]

LGTM, thank you!

[komamitsu]

LGTM! 👍

[feeblefakie]

LGTM! Thank you!