Plugin ResolveRequire is getting the wrong URI

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### How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

### Which OS are you using?

Windows/Linux

### What is the issue affecting?

Plugins

### Expected Behaviour

Over the [plugins page](https://luals.github.io/wiki/plugins/#resolverequire) it seems to me like ResolveRequire first parameter is the current file the require is being typed at.

### Actual Behaviour

But in reality it seems to be the workspace URI, not the file.

### Reproduction steps

1. Make a new plugin
2. Paste the same code shown in screenshot
3. Type out some `require` statement, you will see the URI of the workspace in the output instead of the `require` statement file.

### Additional Notes

See https://github.com/LuaLS/LuaLS.github.io/issues/48

### Log File

_No response_

Start at the plugin ResolveRequire entry point and compare the URI passed while typing a require statement with the behavior described on the plugins page. Reproduce the issue in the VS Code extension using the screenshot’s plugin example; done means the callback receives the require statement’s file URI rather than the workspace URI.

Written by the indexing model from the issue text.