fix(vue): volar v1 support

[creativenull]

According to the discussion over on #4460 (reply in thread)

I've identified that volar v1 does have breaking changes.

Following the volar discussion (vuejs/language-tools#2279) I've adjusted the initialization options and added a warning message instructing the user to install typescript in the project in order for volar to work.

[hsanson]

Don't use volar myself but changes look good and this is affecting many users. Merging so it can be further tested.

[theahura]

Thanks for the quick turnaround on this!
Testing this merge on my machine, I get the following:

 Current Filetype: vue
Available Linters: ['cspell', 'vls', 'volar', 'cspell', 'deno', 'eslint', 'fecs', 'flow', 'flow-language-server', 'jscs', 'jshint', 'standard', 'tsserver', 'xo']
  Enabled Linters: ['volar']
  Ignored Linters: []
 Suggested Fixers: 
  'prettier' - Apply prettier to a file.
  'remove_trailing_lines' - Remove all blank lines at the end of a file.
  'trim_whitespace' - Remove all trailing whitespace characters at the end of every line.
 Linter Variables:

let g:ale_vue_volar_executable = 'vue-language-server'
let g:ale_vue_volar_init_options = {'typescript': {'tsdk': ''}}
let g:ale_vue_volar_use_global = 1
 Global Variables:

let g:ale_cache_executable_check_failures = v:null
let g:ale_change_sign_column_color = 0
let g:ale_command_wrapper = v:null
let g:ale_completion_delay = v:null
let g:ale_completion_enabled = 0
let g:ale_completion_max_suggestions = v:null
let g:ale_disable_lsp = 0
let g:ale_echo_cursor = 1
let g:ale_echo_msg_error_str = 'Error'
let g:ale_echo_msg_format = '%code: %%s'
let g:ale_echo_msg_info_str = 'Info'
let g:ale_echo_msg_warning_str = 'Warning'
let g:ale_enabled = 1
let g:ale_fix_on_save = 0
let g:ale_fixers = {}
let g:ale_history_enabled = 1
let g:ale_history_log_output = 1
let g:ale_keep_list_window_open = 0
let g:ale_lint_delay = 200
let g:ale_lint_on_enter = 1
let g:ale_lint_on_filetype_changed = 1
let g:ale_lint_on_insert_leave = 1
let g:ale_lint_on_save = 1
let g:ale_lint_on_text_changed = 'normal'
let g:ale_linter_aliases = {}
let g:ale_linters = {'vue': ['volar']}
let g:ale_linters_explicit = 0
let g:ale_linters_ignore = {}
let g:ale_list_vertical = 0
let g:ale_list_window_size = 10
let g:ale_loclist_msg_format = '%code: %%s'
let g:ale_max_buffer_history_size = 20
let g:ale_max_signs = -1
let g:ale_maximum_file_size = v:null
let g:ale_open_list = 0
let g:ale_pattern_options = v:null
let g:ale_pattern_options_enabled = v:null
let g:ale_root = {}
let g:ale_set_balloons = 0
let g:ale_set_highlights = 1
let g:ale_set_loclist = 1
let g:ale_set_quickfix = 0
let g:ale_set_signs = 1
let g:ale_sign_column_always = 0
let g:ale_sign_error = '>>'
let g:ale_sign_info = '--'
let g:ale_sign_offset = 1000000
let g:ale_sign_style_error = '>>'
let g:ale_sign_style_warning = '--'
let g:ale_sign_warning = '--'
let g:ale_sign_highlight_linenrs = 0
let g:ale_statusline_format = v:null
let g:ale_type_map = {}
let g:ale_use_neovim_diagnostics_api = 0
let g:ale_use_global_executables = v:null
let g:ale_virtualtext_cursor = 'all'
let g:ale_warn_about_trailing_blank_lines = 1
let g:ale_warn_about_trailing_whitespace = 1
  Command History:

(executable check - failure) vue-language-server

Specifically at the bottom, getting an exec check failure for the vue-language-server. I already have installed typescript in the package I am running; are there other dependencies?

[creativenull]

You need to have the vue-language-server installed globally with npm install -g @volar/vue-language-server or have it at v1.

[theahura]

Ah it had to be global. Thanks a ton!