Introduce function

[cmstead]

Use a selected function call/usage to introduce a new function declaration.

This is an action-type behavior

Key behaviors:

• Accessible by the same means as other automated tools
  • Context menu (action submenu)
  • Action palette
  • No keybinding
• Allows user to simply place cursor on call or usage and perform the introduce action
• Must provide an opportunity for the user to choose the scope for introduction
• Must start with a body which throws a new "not implemented" error
• Must use the name of the original call/usage
• Provide an opportunity to declare paramteres
• If being introduced from a call, validate the parameter count matches the argument count

Error conditions

• No function call/use selected
• No scope selected
• No name provided
• Parameter length incorrect (as appropriate)

[cmstead]

This is complete as of 0.22.3:

https://github.com/cmstead/js-codeformer/releases/tag/v0.22.3