Add Ada 2022 @ syntax

[MyApaulogies]

No description provided.

[dinkelk]

@MyApaulogies - can you use rebase -i to drop the first and last commits in the PR. We don't need commits where you add and then later remove the fsh script. Although it is pretty cool to see!

[dinkelk]

@MyApaulogies's script used for replacement at-syntax.fish:

# requires moreutils and ripgrep
for i in 1 2
    set -l regex '^(\s*(\S.*?)\h+:=.*?(\h|\())\2((\.|\h|\)).*?;)'
    for file in (rg -P --multiline $regex -l)
        rg -P --multiline $regex -r '$1@$4' "$file" -N --passthru | sponge "$file"
    end
end