This uses the language server settings added in #9293 to allow users to
specify the binary path and arguments with which to start up `clangd`.
Example user settings for `clangd`:
```json
{
"lsp": {
"clangd": {
"binary": {
"path": "/usr/bin/clangd",
"arguments": ["--log=verbose"]
},
}
}
}
```
Constraints:
* Right now this only allows ABSOLUTE paths.
Release Notes:
- Added ability to specify `clangd` binary `path` (must be absolute) and
`arguments` in user settings. Example: `{"lsp": {"clangd": {"binary":
{"path": "/usr/bin/clangd", "arguments": ["--log=verbose"] }}}}`
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