gh-157777 Add commands to configure skipped modules in pdb - #157780

skip_stdlib adds exact and .* patterns for every name in sys.stdlib_module_names. Consequently, running skip afterward prints a large list.

My current implementation displays the complete underlying pattern set. This avoids additional state and keeps skip_stdlib equivalent to adding ordinary skip patterns.

Would maintainers prefer the complete transparent listing, or some summarized representation?

e.g. summarized

Skipped module patterns:
    package.*
Standard-library modules:
    enabled

If the summarized version is preferred, then how do we present it if a user decides to do unskip os.*?

I personally see a lot of value in a command for skipping all of the stdlib but it is adding extra complexity to this implementation with respect to how to display what is being skipped to the user.