Fix DebugLogger to log exception details

[kevinchalet]

@BrennanConroy recently fixed EventLogLogger to log exceptions, but DebugLogger didn't get the same love: 6b07c6a#diff-9bbe2418382dbe1fba6ad79cb1f4a081R104.

That would be great if the debug logger could log exception details: https://github.com/aspnet/Logging/blob/dev/src/Microsoft.Extensions.Logging.Debug/DebugLogger.cs#L75.

/cc @davidfowl

[muratg]

@BrennanConroy Could you review the remaining implementations and do the same thing across the board?

[ORuban]

Hi, I have created a PR #391 using the same way as for EventLogLogger.

And actually I have a question about formatting:

• in TraceSourceLogger the only one Environment.NewLine is added before exception // link to code
• in EventLogLogger (and so in this PR for DebugLogger) there are two Environment.NewLine(s) before exception // link to code

So maybe add/remove one Environment.NewLine ?

[BrennanConroy]

@loudej You said 2 newlines for EventLogLogger, how about for DebugLogger?

[BrennanConroy]

@lodejard
Whoops, used your other one, see above

[BrennanConroy]

9f4dee9

[kevinchalet]

Thanks! 👏 👏