Add vim.ui.select picker for when multiple handlers are registered

[rmagatti]

Rework matching and opening functions for better multi-registration handling

The plugin now takes the following steps after gx:

1. Checks what glob patterns match the absolute current path
2. For each of these matched patterns it tries calling match_to_url
3. If more than one succeeds it shows the selection menu through vim.ui.select. If not it opens the only succeeding call.

Changes

• Added debug logs for registry and matched_patterns in the lib.lua file.
• Modified the try_open function in the lib.lua file to handle multiple registrations.
• Added a select menu functionality when more than one handler is registered in the lib.lua file.
• Added a name property to the RegistrationSpec in the lib.lua file.
• Added a new match_to_url function to handle URLs with and without protocols in the no-protocol-urls extension in the no-protocol-urls.lua file.

[lua/gx-extended/lib.lua]

• Add debug log for registry
• Add debug log for matched_patterns
• Modify try_open to handle multiple registrations
• Show select menu when more than one handler registered
• Add name property to RegistrationSpec [lua/gx-extended/extensions/no-protocol-urls.lua]
• Add a new match_to_url function to handle URLs with and without protocols in the no-protocol-urls extension

https://github.com/rmagatti/gx-extended.nvim/assets/2881382/f7f09f3b-cd88-4f91-a1db-d2f4dc9246c2

Closes #10