Add "sneak-clever-s" mode to vim-sneak emulation

From vim-sneak's documentation:

                                                        *sneak-clever-s*
Similar to clever-f[3], immediately after invoking Sneak you can move to the
next match by hitting `s` (or `S`) again. If you instead move the cursor or do
something else, then `s` starts a new Sneak. In that case, you can repeat the
most recent Sneak search by pressing "s<Enter>" (or whatever key, if any, you
mapped to <Plug>Sneak_;). To enable "clever s": >
    let g:sneak#s_next = 1
<
Sneak adds to the |jumplist| only on the initial invocation; so after moving
around with ; and , (or s/S) you can easily go back via |CTRL-O| or |``|.
    - Repeat invocations (;/,) do not add to the jumplist.
    - Consecutive invocations ("s" immediately after s/S/;/,)
      do not add to the jumplist.

s<Enter> ("s" followed by Enter) always repeats the last search, even if |;|
and |,| were reset by |f| or |t|. This is especially useful for re-invoking
|sneak-label-mode| (because |;| and |,| never invoke label-mode).

I'd love to have this feature come to vim-sneak's emulation in VSCode.

No implementation files or tests are named. Start by reading the linked vim-sneak documentation and locating the existing Sneak emulation and related tests in the TypeScript VS Code Vim extension; done means matching the described clever-s behavior, repeat handling, and jumplist rules.