In the api_info() output:

    :new|put =map(filter(api_info().functions, '!has_key(v:val,''deprecated_since'')'), 'v:val')
    ...

    {'return_type': 'ArrayOf(Integer, 2)', 'name': 'nvim_win_get_position', 'method': v:true, 'parameters': [['Window', 'window']], 'since': 1}

The `ArrayOf(Integer, 2)` return type didn't break clients when we added
it, which is evidence that clients don't use the `return_type` field,
thus renaming Dictionary => Dict in api_info() is not (in practice)
a breaking change.

This is a breaking change which will make refactor of typval and shada
code a lot easier. In particular, code that would use or check for
v:msgpack_types.binary in the wild would be broken. This appears to be
rarely used in existing plugins.

Also some cases where v:msgpack_type.string would be used to represent a
binary string of "string" type, we use a BLOB instead, which is
vimscripts native type for binary blobs, and already was used for BIN
formats when necessary.

msgpackdump(msgpackparse(data)) no longer preserves the distinction
of BIN and STR strings. This is very common behavior for
language-specific msgpack bindings. Nvim uses msgpack as a tool to
serialize its data. Nvim is not a tool to bit-perfectly manipulate
arbitrary msgpack data out in the wild.

The changed tests should indicate how behavior changes in various edge
cases.

Specifically, functions that are run in the context of the test runner
are put in module `test/testutil.lua` while the functions that are run
in the context of the test session are put in
`test/functional/testnvim.lua`.

Closes https://github.com/neovim/neovim/issues/27004.

Work on https://github.com/neovim/neovim/issues/27004.

- remove helpers.cur*meths
- remove helpers.nvim

Problem:
Not all Lua code is checked by stylua. Automating code-style is an
important mechanism for reducing time spent on accidental
(non-essential) complexity.

Solution:
- Enable stylua for entire `test/` directory.
- Exclude these high-churn files until this issue is resolved: https://github.com/JohnnyMorganz/StyLua/issues/829
  ```
  test/functional/ui/decorations_spec.lua  | 3560 ++++++++++++++++++++++++++++++++++++----------------
  test/functional/ui/float_spec.lua        | 5826 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------------------------
  test/functional/ui/multigrid_spec.lua    | 1349 ++++++++++++++------
  ```
- Make surgical changes to these files (or add `stylua: ignore` in some
  small scopes) to improve the result:
  ```
  test/functional/vimscript/msgpack_functions_spec.lua | 1414 +++++++++++++++------
  test/functional/api/buffer_spec.lua                  | 1389 +++++++++++----------
  test/functional/api/vim_spec.lua                     | 2740 +++++++++++++++++++++++-----------------
  ```
- These "high churn" files are NOT excluded because the changes are
  largely an improvement:
  ```
  test/functional/plugin/lsp_spec.lua      | 2198 ++++++++++++++++++---------------
  test/functional/plugin/shada_spec.lua    | 4078 +++++++++++++++++++++++++++++++++++-------------------------
  test/functional/ui/cmdline_spec.lua      | 1199 +++++++++++-------
  test/functional/ui/popupmenu_spec.lua    | 1267 +++++++++++--------
  test/functional/ui/messages_spec.lua     | 1643 +++++++++++++++---------
  ```
- TODO: how to check "all directories"? With `GLOB_DIRS *` and `/.deps/` (or
  `.deps/`) in `.styluaignore`, Lua code in `.deps/` is still checked...

Extend the capabilities of is_os to detect more platforms such as
freebsd and openbsd. Also remove `iswin()` helper function as it can be
replaced by `is_os("win")`.