Added support for logsafe Arg arrays in Slf4jLogsafeArgs.

[aioobe]

Before this PR

Slf4jLogsafeArgs complains that an Arg<?>[] isn't a logsafe argument.

After this PR

==COMMIT_MSG==
Slf4jLogsafeArgs now allows Arg<?>[] to be passed as vararg argument to logging methods.
==COMMIT_MSG==

Possible downsides?

None.

Context

Only allowing Arg<?>[] gets us half way. Compiler would still give the the following diagnostic warning:

... non-varargs call of varargs method with inexact argument type for last parameter;
        cast to java.lang.Object for a varargs call
        cast to java.lang.Object[] for a non-varargs call and to suppress this warning 

By following the above suggestion and casting to Object[] the expression is no longer of Arg<?>[] type, hence we add support also for Arg<?>[] cast into an Object[].

For // BUG: Diagnostic contains: varargs method with inexact argument to work, we can't only pick up Slf4jLogsafeArgs diagnostics, so we add .matchAllDiagnostics().

With .matchAllDiagnostics() we need to add @SuppressWarnings("deprecation") in order to avoid diagnostics about hasChildren being deprecated.

[carterkozak]

Description is a little out of date now, and it needs a changelog. I'm happy to merge this once those are in :-)

[carterkozak]

I think this needs to have develop merged into it to pick up the unit-test-14 check

[ferozco]

👍

[svc-autorelease]

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