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 (closed) and #8113 (closed)