refactor!: remove `nvim` and `provider` module for checkhealth

The namespacing for healthchecks for neovim modules is inconsistent and
confusing. The completion for `:checkhealth` with `--clean` gives

```
nvim
provider.clipboard
provider.node
provider.perl
provider.python
provider.ruby
vim.lsp
vim.treesitter
```

There are now three top-level module names for nvim: `nvim`, `provider`
and `vim` with no signs of stopping. The `nvim` name is especially
confusing as it does not contain all neovim checkhealths, which makes it
almost a decoy healthcheck.

The confusion only worsens if you add plugins to the mix:

```
lazy
mason
nvim
nvim-treesitter
provider.clipboard
provider.node
provider.perl
provider.python
provider.ruby
telescope
vim.lsp
vim.treesitter
```

Another problem with the current approach is that it's not easy to run
nvim-only healthchecks since they don't share the same namespace. The
current approach would be to run `:che nvim vim.* provider.*` and would
also require the user to know these are the neovim modules.

Instead, use this alternative structure:

```
vim.health
vim.lsp
vim.provider.clipboard
vim.provider.node
vim.provider.perl
vim.provider.python
vim.provider.ruby
vim.treesitter
```

and

```
lazy
mason
nvim-treesitter
telescope
vim.health
vim.lsp
vim.provider.clipboard
vim.provider.node
vim.provider.perl
vim.provider.python
vim.provider.ruby
vim.treesitter
```

Now, the entries are properly sorted and running nvim-only healthchecks
requires running only `:che vim.*`.

1 files changed, 0 insertions, 90 deletions

diff --git a/runtime/lua/provider/perl/health.lua b/runtime/lua/provider/perl/health.lua
deleted file mode 100644
index 535093d793..0000000000
--- a/runtime/lua/provider/perl/health.lua
+++ /dev/null
@@ -1,90 +0,0 @@
-local health = vim.health
-
-local M = {}
-
-function M.check()
-  health.start('Perl provider (optional)')
-
-  if health.provider_disabled('perl') then
-    return
-  end
-
-  local perl_exec, perl_warnings = vim.provider.perl.detect()
-
-  if not perl_exec then
-    health.warn(assert(perl_warnings), {
-      'See :help provider-perl for more information.',
-      'You may disable this provider (and warning) by adding `let g:loaded_perl_provider = 0` to your init.vim',
-    })
-    health.warn('No usable perl executable found')
-    return
-  end
-
-  health.info('perl executable: ' .. perl_exec)
-
-  -- we cannot use cpanm that is on the path, as it may not be for the perl
-  -- set with g:perl_host_prog
-  local ok = health.cmd_ok({ perl_exec, '-W', '-MApp::cpanminus', '-e', '' })
-  if not ok then
-    return { perl_exec, '"App::cpanminus" module is not installed' }
-  end
-
-  local latest_cpan_cmd = {
-    perl_exec,
-    '-MApp::cpanminus::fatscript',
-    '-e',
-    'my $app = App::cpanminus::script->new; $app->parse_options ("--info", "-q", "Neovim::Ext"); exit $app->doit',
-  }
-  local latest_cpan
-  ok, latest_cpan = health.cmd_ok(latest_cpan_cmd)
-  if not ok or latest_cpan:find('^%s*$') then
-    health.error(
-      'Failed to run: ' .. table.concat(latest_cpan_cmd, ' '),
-      { "Make sure you're connected to the internet.", 'Are you behind a firewall or proxy?' }
-    )
-    return
-  elseif latest_cpan[1] == '!' then
-    local cpanm_errs = vim.split(latest_cpan, '!')
-    if cpanm_errs[1]:find("Can't write to ") then
-      local advice = {}
-      for i = 2, #cpanm_errs do
-        advice[#advice + 1] = cpanm_errs[i]
-      end
-
-      health.warn(cpanm_errs[1], advice)
-      -- Last line is the package info
-      latest_cpan = cpanm_errs[#cpanm_errs]
-    else
-      health.error('Unknown warning from command: ' .. latest_cpan_cmd, cpanm_errs)
-      return
-    end
-  end
-  latest_cpan = vim.fn.matchstr(latest_cpan, [[\(\.\?\d\)\+]])
-  if latest_cpan:find('^%s*$') then
-    health.error('Cannot parse version number from cpanm output: ' .. latest_cpan)
-    return
-  end
-
-  local current_cpan_cmd = { perl_exec, '-W', '-MNeovim::Ext', '-e', 'print $Neovim::Ext::VERSION' }
-  local current_cpan
-  ok, current_cpan = health.cmd_ok(current_cpan_cmd)
-  if not ok then
-    health.error(
-      'Failed to run: ' .. table.concat(current_cpan_cmd, ' '),
-      { 'Report this issue with the output of: ', table.concat(current_cpan_cmd, ' ') }
-    )
-    return
-  end
-
-  if vim.version.lt(current_cpan, latest_cpan) then
-    local message = 'Module "Neovim::Ext" is out-of-date. Installed: '
-      .. current_cpan
-      .. ', latest: '
-      .. latest_cpan
-    health.warn(message, 'Run in shell: cpanm -n Neovim::Ext')
-  else
-    health.ok('Latest "Neovim::Ext" cpan module is installed: ' .. current_cpan)
-  end
-end
-
-return M