Allow command name resolution for GHCi commands with option `!` #17345

This commit allows command name resolution for GHCi commands
with option `!` as follows:

    ghci> :k! Int
    Int :: *
    = Int

This commit changes implementation as follows:

Before:
  * Prefix match with full string including the option `!` (e.g. `k!`)

After (this patch):
  * Prefix match without option suffix `!` (e.g. `k`)
  * in addition, suffix match with option `!`

See also #8305 and #8113