Fix console logger message format

[filzrev]

This PR change console log message format.
It ensure warning and error code is always included inside log message.

Purpose of this PR
Some IDEs have problem matcher features to distinguish warning/errors category from console output logs.

• Visual Studio: MSBuild and Visual Studio format for diagnostic messages
• Visual Studio Code: Integrate with External Tools via Tasks

For Visual Studio. docfx's console output is almost compatible with VS standard format.
So this PR fix non compatible warnings/error message to VS compliant.

For example

From:
`Can't find the post processor: CustomPostProcessor` 
To:
`warning: Can't find the post processor: CustomPostProcessor`

Note
ConsoleLogListener directly use Console API. so unit tests is difficult to write.
I've confirmed it works as expected with VS debugging mode.

Visual Studio MSBuild integration image

Following code is example project to build and run docfx inside Visual Studio and dotnet command,

<Project Sdk="Microsoft.Build.NoTargets/3.7.0">
    <PropertyGroup>
        <TargetFramework>net7.0</TargetFramework>
    </PropertyGroup>
    
    <ItemGroup>
        <Content Include="**/*" Exclude="*.csproj"/>
    </ItemGroup>

    <!-- Add `Build` MSBuild target. -->
    <Target Name="RunDocfxBuild" AfterTargets="Build" >
        <Exec Command="run.bat"  WorkingDirectory="$(MSBuildThisFileDirectory)">
        </Exec>
    </Target>

    <!-- Customize `dotnet run` commands -->
    <PropertyGroup>
        <RunCommand>docfx</RunCommand>
        <RunArguments>serve _site</RunArguments>
        <RunWorkingDirectory>$(MSBuildThisFileDirectory)</RunWorkingDirectory>
    </PropertyGroup>
</Project>

Error List Results

[codecov]

Codecov Report

Patch coverage: 40.00% and project coverage change: -0.02 ⚠️

Comparison is base (15e87e3) 77.06% compared to head (d3f7575) 77.04%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8916      +/-   ##
==========================================
- Coverage   77.06%   77.04%   -0.02%     
==========================================
  Files         605      605              
  Lines       25038    25042       +4     
==========================================
- Hits        19295    19294       -1     
- Misses       5743     5748       +5     

Impacted Files	Coverage Δ
...oft.DocAsCode.Common/Loggers/ConsoleLogListener.cs	60.00% <40.00%> (-1.54%)	⬇️

... and 2 files with indirect coverage changes

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[yufeih]

Indeed this includes log level for all cases. Thank you @filzrev !