Add/update some commands and general logic

[y0k4i-1337]

This PR adds the following features:

• list_all command to list all apis from default regions
• list command now accept multiple regions as input and show all of them
• region passed as option has precedence over region stored in aws config files
• prune command to remove all apis from specified regions
• option region now accepts a list of regions, either as comma-separated string or file containing regions
• when creating a new api and passing multiple regions, it will choose one randomly
• logic of delete command was changed to avoid iterating over all apis when deleting. Instead, use exceptions to handle specific cases like api not found.