RFR: 8295729: Add jcheck whitespace checking for properties files [v3]

[Magnus Ihse Bursie]

On Fri, 2 Dec 2022 17:12:55 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> This turned out to be much more complicated than anticipated. I am going to close this PR (and bug), and instead I have split up this work in five different bugs:
>> 
>> [JDK-8298047](https://bugs.openjdk.org/browse/JDK-8298047) is about removing all non-significant whitespace from all properties files, basically corresponding to how this PR looked after the second commit.
>> 
>> [JDK-8298042](https://bugs.openjdk.org/browse/JDK-8298042), [JDK-8298044](https://bugs.openjdk.org/browse/JDK-8298044), [JDK-8298045](https://bugs.openjdk.org/browse/JDK-8298045) and [JDK-8298046](https://bugs.openjdk.org/browse/JDK-8298046) is about fixing the significant whitespace, by turning it to unicode sequences or removing it, if it turns out there should not have been a space there. This work is split into four parts to be able to have one bug per component team.
>
>> and instead I have split up this work in five different bugs
> 
> would you consider also adding a unit test to check whether the localized resources also contain leading/trailing whitespace, and possibly special characters (like {, }, , etc.) that are present in the main resource?

@andy-goryachev-oracle No. Any such test is up to the component owners to write, if they deem it fitting.

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PR: https://git.openjdk.org/jdk/pull/10792