fix: resolve workspace folder in config path for better compatibility

[davidsneighbour]

see #66

this allows use of relative path to the config file and variable use and makes the following valid configuration options:

{
  vale.valeCLI.config: /home/patrick/github.com/davidsneighbour/kollitsch.dev/src/config/vale/vale.ini,
  vale.valeCLI.config: /src/config/vale/vale.ini,
  vale.valeCLI.config: ./src/config/vale/vale.ini,
}

[Copilot]

Pull Request Overview

This PR fixes the resolution of the workspace folder in the config path, ensuring better compatibility when using relative paths or variable substitution. The changes introduce logic to resolve "${workspaceFolder}" strings and join relative paths with the workspace root.

• Add logic to retrieve and resolve the config path.
• Replace the direct configuration value with a resolved config object.
• Support both absolute and relative path formats.

Comments suppressed due to low confidence (1)

src/lsp.ts:170

• Ensure that unit tests are updated to cover the new relative path resolution logic for the config path.

    configPath: { value: resolvedConfigPath } as valeArgs,

[ChrisChinchilla]

Thanks @davidsneighbour I need to test this a bit as I don't really use workspaces much (also helps me understand the code for the future) but will do it asap. I am planning a new release soon anyway.

[ChrisChinchilla]

I added details to readme and settings UI, but looks good! I don't think I ever saw this as I have always had complex series of symlinks to ini files.