Reline behind a feature flag

[sjanusz-r7]

This PR is a continuation of #19397

This PR adds in the usage of the Reline library behind a feature flag.

Reline currently has some bugs/issues/inconsistencies compared to Readline. These are tracked as issue reports on Reline's GitHub.
These include:

• Using IO's object encoding to not have to set the encoding globally
• Tab completion append character only being appended when no more completions exist
• Being able to change the completion append character in the completion proc (monkeypatched)
• being able to perform multiple tab completions in a row with different values

We are moving away from Readline in favor if a pure Ruby implementation.
We are having to remove Readline on newer Windows 11 hosts due to an issue that Reline also encountered (and fixed since), where the console output handle would sometimes be incorrect, likely after calling popen, thus calls to console APIs such as SetConsoleCursorPosition would fail. A workaround is to periodically refresh the handle variable by calling handle = GetStdHandle.call(-11) // for STDOUT.

Verification

• WIP

[adfoster-r7]

I think these are redundant if choosing readline libraries is handled by msfenv 👀

[adfoster-r7]

Is this meant to be using the feature flag check to choose between reline or not 👀

[sjanusz-r7]

IRB always uses Reline, unless we specify @CONF[:USE_SINGLELINE] = true when setting up the IRB shell, which we don't currently do here:

metasploit-framework/lib/rex/ui/text/irb_shell.rb

Line 29 in e6615d3

IRB.setup(nil)

I'll add in a helper here to check for this flag and default to :reline if !use_singleline or use_multiline as they are xor'd.

[sjanusz-r7]

I am using this to make sure that IRB uses Reline, allowing us to set input_library: :reline in calls to with_context when interacting with the history manager.

[adfoster-r7]

Rex::Post::Meterpreter::Ui::Console::CommandDispatcher::Core ..........F.........

  4) Rex::Post::Meterpreter::Ui::Console::CommandDispatcher::Core behaves like session command dispatcher Core commands #cmd_irb runs an irb shell instance
     Failure/Error: raise NoMethodError, msg

     NoMethodError:
       Method 'autocompletion' not found in Module
     Shared Example Group: "session command dispatcher" called from ./spec/lib/rex/post/meterpreter/ui/console/command_dispatcher/core_spec.rb:24
     # ./lib/msf/ui/console/msf_readline.rb:26:in `method_missing'
     # ./lib/msf/ui/console/msf_readline.rb:34:in `cache_current_config'
     # ./lib/msf/ui/console/command_dispatcher/session.rb:99:in `cmd_irb'
     # ./spec/support/shared/examples/msf/ui/console/command_dispatcher/session.rb:56:in `block (4 levels) in <top (required)>'
Rex::Post::PostgreSQL::Ui::Console::CommandDispatcher::Core .....F..............

  5) Rex::Post::PostgreSQL::Ui::Console::CommandDispatcher::Core behaves like session command dispatcher Core commands #cmd_irb runs an irb shell instance
     Failure/Error: raise NoMethodError, msg

     NoMethodError:
       Method 'autocompletion' not found in Module
     Shared Example Group: "session command dispatcher" called from ./spec/lib/rex/post/postgresql/ui/console/command_dispatcher/core_spec.rb:32
     # ./lib/msf/ui/console/msf_readline.rb:26:in `method_missing'
     # ./lib/msf/ui/console/msf_readline.rb:34:in `cache_current_config'
     # ./lib/msf/ui/console/command_dispatcher/session.rb:99:in `cmd_irb'
     # ./spec/support/shared/examples/msf/ui/console/command_dispatcher/session.rb:56:in `block (4 levels) in <top (required)>'