Refactoring constructors and make methods to remove unused encoding

[sofia-tekdatum]

The encoding is page level information, not column-level information. This is captured at the page level and set in the UpdateEncryptorMetadata method, so removing from the Make and constructor methods.

Verified all tests pass and the base_app does the right thing.

[github-actions]

Thanks for opening a pull request!

If this is not a minor PR. Could you open an issue for this pull request on GitHub? https://github.com/apache/arrow/issues/new/choose

Opening GitHub issues ahead of time contributes to the Openness of the Apache Arrow project.

Then could you also rename the pull request title in the following format?

GH-${GITHUB_ISSUE_ID}: [${COMPONENT}] ${SUMMARY}

or

MINOR: [${COMPONENT}] ${SUMMARY}

See also:

• Other pull requests
• Contribution Guidelines - Contributing Overview

[argmarco-tkd]

Thank you for this - LGTM, ship it!