Provide config option to disable showing line numbers

[jethrodaniel]

Your proposal
Provide a config option to disable showing line numbers.

Example:

• config set show_line_numbers true shows line numbers (the default)
• config set show_line_numbers false hides line numbers (like pry's @ -n)

Additional context
This is particularly useful when copying code from the debug session.

[gwillcox-r7]

Initial inspection using Sourcegraph shows this will likely require updating check_line_num! in test/support/test_case.rb as noted at https://sourcegraph.com/github.com/ruby/debug/-/blob/test/support/test_case.rb?L66-71, accounting for test_the_test_fails_when_the_script_doesnt_have_line_numbers at https://sourcegraph.com/github.com/ruby/debug/-/blob/test/support/test_case_test.rb?L22-28, and updating https://sourcegraph.com/github.com/ruby/debug/-/blob/test/support/assertions.rb?L5-9 in test/support/assertions.rb.

This would be in addition to adding in the new option. Looks like line numbers are currently tied into the current test stack quite a bit. It might be possible to remove this dependency but the changes would need to be careful to properly handle the cases above, and we would also potentially need to make sure callers of those functions update their function calls if we change the parameters of any of these calls.

[ko1]

Do you want to remove "current line" marker too?

[ko1]

Could you write the current output and expected output with small code?
(it is easy to understand the request)

[ko1]

#973