[IntelliJ] Improve Logging support of IDE-specific messages

[keithchong]

Codewind version: latest
OS: any

IDE extension version: latest
IDE version: 2019.3

Description of the enhancement:
Improve log support of our Codewind Intellij plugin
Currently we log our INFO level messages to the IntelliJ log file (eg. idea.log) and we are inundating it with our messages, including entire JSON responses from turbine/portal. We need to add debug and trace level flags that need to be turned on in order for the messages to be logged to the log file.

[sishida]

Assigning myself to help with docs work! 🖊️

[keithchong]

The existing methods will continue to use the class-specific logger category

Logger.log(...) - should be used sparingly since by default INFO messages get written to the log
Logger.logWarning(...) - writes message to log and to console output

The following methods will be added and they will use the generic org.eclipse.codewind category. This category will serve as the 'flag' that the user has to turn on from the Debug Log Settings dialog (or IDE-wide via VM settings) in order for the messages to be written to the log. eg. #org.eclipse.codewind to turn on debug level messages and #org.eclipse.codewind:trace to turn on trace level messages.

Logger.logDebug(...)
Logger.logTrace(...)

Sample debug message: (Note DEBUG level). This particular message change affecting CodewindApplicationFactory will be included in this PR.

2020-04-24 10:53:01,769 [  10366]  DEBUG -          #org.eclipse.codewind - org.eclipse.codewind.intellij.core.CodewindApplicationFactory - [
  {
    "projectID": "13a796c0-831a-11ea-8d0a-fbbaa43527c8",
    "name": "cwGo01",
    "codewindVersion": "0.11.0",
    "language": "go",
    "creationTime": 1587739659654,
    ....
    ....
      ]
    }
  }
] 

The current INFO messages look like this
2020-04-24 11:15:27,562 [ 74276] INFO - ellij.core.CodewindApplication - Set HTTP port for null to 32781

These should be changed to debug or trace level messages and should not be shown in production. These should be changed in a separate PR.

[tetchel]

this section can use a quick update to mention intellij
https://www.eclipse.org/codewind/troubleshooting.html#setting-codewind-server-log-levels

[keithchong]

Closing. Follow-up issue is: #2819