feat(plugin-encryption): enhance encryption internal plugin to support encryption of binary data

[nishantmc-test]

This pull request addresses

Providing support to encrypt binary data. Inputs are kmsKeyUri and binary data.

by making the following changes

Added new method encryptBinaryData in encryption.js.

Change Type

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Tooling change
• Internal code refactor

The following scenarios were tested

Unit test

< ENUMERATE TESTS PERFORMED, WHETHER MANUAL OR AUTOMATED >

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• This PR is related to
  • Feature
  • Defect fix
  • Tech Debt
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I certified that

• I have read and followed contributing guidelines
• I discussed changes with code owners prior to submitting this pull request
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• All existing and new tests passed
• I have updated the documentation accordingly

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Convert non-Buffer inputs before encrypting binary data

encryptBinaryData() documents support for Buffer|ArrayBuffer|Blob|File, but it passes data straight into ensureBuffer(), which only accepts Buffer-like objects (constructor.isBuffer). In browser paths where callers naturally provide Blob, File, or ArrayBuffer, this method will reject with `buffer` must be a buffer and never encrypt, so the new feature does not work for the documented binary input types.

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[nishantmc-test]

Vidcast demoing the manual test: https://app.vidcast.io/share/c9427663-bf97-4875-ab4b-4d25d71d6993