logging changes

[deepchoudhery]

changes :

• removed CleanConsoleFormatter, CleanConsoleFormatterOptions, ConsoleLoggerExtensions
• added AnsiConsoleSink
  • check if being invoked by dotnet-scaffold and colorize output accordingly (let dotnet-scaffold do it if that's where output is going)
• configure Serilogger in ScaffolderRunnerBuilder
• verbose logging and logging to file set through command line flags using dotnet-scaffold
  • --verbose and --log-to-file
  • LAUNCHED_BY_DOTNET_SCAFFOLD gets set in CommandExecuteFlowStep and then read in ScaffolderRunnerBuilder to configure the LoggerConfiguration

all the different options and ways to enable logging:
dotnet-scaffold

• use option --verbose (bool option):
  • enables verbose logging which corresponds to logging level Trace.
  • adds environment variable ENABLE_VERBOSE_LOGGING to "true".
• use option --log-to-file (bool option):
  • enables logging to file regardless of logging level (Information or Trace are the only options currently)
  • adds environment variable LOG_TO_FILE to "true".

dotnet-scaffold-aspnet/aspire : env vars above can be set manually (if running standalone) or through dotnet-scaffold options

• verbose logging :
  • check for ENABLE_VERBOSE_LOGGING env var
  • if enabled, set minimum logging level to Verbose using LoggerConfiguration().MinimumLevel.Verbose()
  • ILogger.LogDebug and ILogger.LogTrace are only enabled (and colorized using the AnsiConsoleSink
• logging to file :
  • check for LOG_TO_FILE env var
  • use/create .\%USERPROFILE%\.dotnet-scaffold\.logs folder at the current location and add '.log' logs to this location
  • in the format 'dotnet-scaffold-YYYY-mm-DD_hh-MM.log`
  • scenarios :
    • files are created per execution. The timestamp will be from the minute logging is setup in the ScaffolderRunnerBuilder (this might differ from when dotnet-scaffold execution starts due to interactivity and time taken to reach this code block)
    • on consequent executions in the same minute, log files postfixed with -X with X being a number.
    • timestamp is local system time (using DateTime.Now) since its the .NET standard and more uniform.
    • files created with .log extension (the .NET standard).

[tlmii]

@deepchoudhery Could you add some examples of how the logging options would be used by the end user in the PR description? They seem pretty straightforward, but I want to make sure.