complete: add extra-verbose support to _rg_types

[okdana]

When the extra-verbose style is set for the types tag, completed types are displayed along with the patterns they correspond to. This can be enabled by e.g. adding the following to .zshrc:

zstyle ':completion:*:rg:*:types' extra-verbose true

This change also makes _rg_types use the actual rg specified on the command line to look up types, and it fixes a mangled complete-all style check

Fixes #2195