fix(protect-dynamodb): Fixed bug when handling schema definitions

[calvinbrewer]

Fixed bug when handling schema definitions without an equality flag.

--- Original report

I think I found a bug, where phoneNumber is csColumn but no .equality, it is missing after encryptModel

{
  input: {
    id: '01ABCDEFGHIJKLMNOPQRSTUVWX',
    email: 'test.user@example.com', 
    address: '123 Main Street',
    createdAt: '2024-08-15T22:14:49.948Z',
    firstName: 'John',
    lastName: 'Smith',
    phoneNumber: '555-555-5555',
    companyName: 'Acme Corp',
    batteryBrands: ['Brand1', 'Brand2'],
    metadata: { role: 'admin' }
  },
  protectTable: {
    email: { cast_as: 'text', indexes: [Object] },
    firstName: { cast_as: 'text', indexes: [Object] },
    lastName: { cast_as: 'text', indexes: [Object] },
    phoneNumber: { cast_as: 'text', indexes: {} }
  },
  result: {
    data: {
      id: '01ABCDEFGHIJKLMNOPQRSTUVWX',
      email__hmac: 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
      email__source: 'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb',
      address: '123 Main Street',
      createdAt: '2024-08-15T22:14:49.948Z',
      firstName__hmac: 'ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc',
      firstName__source: 'dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd',
      lastName__hmac: 'eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee',
      lastName__source: 'fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff',
      companyName: 'Acme Corp',
      batteryBrands: [Array],
      metadata: [Object]
    }
  }
}

My schema

const dynamoCipherstashTestSchema = csTable('dynamo_cipherstash_test', {
  email: csColumn('email').equality(),
  firstName: csColumn('firstName').equality(),
  lastName: csColumn('lastName').equality(),
  phoneNumber: csColumn('phoneNumber'),
})