Add ability to specify non-default language server and package.json path via LSP settings

[GamerGirlandCo]

closes #76

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[GamerGirlandCo]

@cla-bot check

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The cla-bot has been summoned, and re-checked this pull request!

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[GamerGirlandCo]

@cla-bot check

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[merlinz01]

@GamerGirlandCo When I try to install this extension with your changes I get this:

    error[E0433]: failed to resolve: use of undeclared crate or module `log`
      --> src/vue.rs:42:9
       |
    42 |         log::info!(
       |         ^^^ use of undeclared crate or module `log`
    
    For more information about this error, try `rustc --explain E0433`.
    error: could not compile `zed_vue` (lib) due to 1 previous error