Enable Encryption and/or Signing Only when Annotated [Feature Request]

[pluttrell]

Currently the library encrypts and signs every field in all entities by default unless @DoNotEncrypt or @DoNotTouch are applied to fields or types.

The feedback I'd like to provide is that most all projects that I've been a part of aren't willing to accept the overhead of client-side encryption on every field and table. It's usually just a few sensitive fields, where the overhead is justified (or required from a regulatory standpoint). Imagine a project with 50 tables where only one requires client-side encryption. With the current default users need to annotate 49 entities with @DoNotTouch and leave one table without any annotations - the one where we do want to encrypt attributes.

This feature request is to add a way to change the default to not do anything unless one of the following new annotations are found on the entity or field: @Encrypt or @EncryptAndSign.