#2774 Locally encrypted properties can be used in "in" queries

[rPraml]

Ebean already supports encrypted properties in "eq" queries. (See #2774)

Now we can also use them in "in" queries.

Note: locally encrypted properties can be used only in exact match queries https://ebean.io/docs/features/encryption#encrypted

[rPraml]

This PR mainly adds the missing local encryption feature for "in" query.

For the sake of completenes, I reviewed the existing expressions and made this overview:

Expression           | dbEnc | local |
---------------------+-------+-------+
InQuery              | No¹   |   -   |
Like                 | Yes   |   -   |
Simple               | Yes   | Yes   |
CaseInsensitiveEqual | Yes   |   -   |
Null                 | Yes²  | Yes²  |
ArrayContains        | No¹   | No¹   |
NativeILike          | Yes   |   -   |
InRange              | No¹   |   -   |
In                   | Yes   | Yes   |
JsonPath             |   -   |   -   |
InPairs              | No¹   | No¹   |
Bitwise              | No¹   |   -   |
AbstractText         |   -   |   -   |
Between              | No¹   |   -   |
ArrayIsEmpty         |   -²  |   -   |
IsEmpty              |   -²  |   -   |

-) Technically not possible/makes no sense
¹) Could be implemented
²) Null/Empty values are not encrypted

@rbygrave There are some expressions left, that do not yet support dbEncryption (although ebean claims it's fully transparent)
It should be easy to add "dbEncryption" support for InRange / Bitwise / Between (it is straightforward to Like and if you want, I can do that in a separate PR)

InPairs woud be more difficult, as it should be possible also to add local encryption support and I'm unsure if it will make sense
I'm unsure, what to do with ArrayContains - It's technically possible, but as far as I see, this is very postgres specific.
I would not add dbEncryption support for InQuery- if you use a subquery on an encrypted property, it is very likely, that the result of the subquery is also encrypted (at least it should be)

Cheers
Roland