Problem:
If `vim.lsp.enable()` fails with an error, either because `'*'` is one
of the provided names or because there is an error in a config,
`vim.lsp.enable()` will still have side-effects:
- All names before the one that encountered an error will still be added
to `lsp._enabled_configs`, but the autocommand will not get added or
run.
- Any name which makes `vim.lsp.config[name]` error will be added to
`lsp._enabled_configs`, causing all future calls to `vim.lsp.enable()`
to fail. This will also break `:che vim.lsp`.
Solution:
- Check all names for errors before modifying `lsp._enabled_configs`.
- Check `vim.lsp.config[name]` does not raise an error before enabling
the name.
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