Issue: Errors in configuration file prevent extension loading

[skamansam]

Describe the bug
If there are any validation errors in the frontmatter.json file, the extension fails to load anything but the sidebar icon and panel. When the panel is opened, there is a visible indeterminate progress bar but nothing else happens. Attempts to show the dashboard cause VSCode to throw an error that the frontmatter.dashboard command doesn't exist.

To Reproduce
Steps to reproduce the behavior:

1. Open frontmatter.json
2. add a comma at the end of a dictionary or invalidate the json is some other way.
3. reload the window

Expected behavior

1. A typical VSCode error notification is displayed upon extension load that says the frontmatter.json file has errors, and clicking on that notification will display the errors, as is typical for error reporting.
2. The extension will load properly and all the default values are loaded instead.
3. When going to the frontmatter dashboard, a notice is given that there a fontmatter.json file exists and that there are problems with it.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: Linux (Fedora 36)
• Browser n/a
• Version: all

[estruyf]

@skamansam, thanks for opening an issue on this. We'll check what we can do to make the experience better.

[estruyf]

@skamansam, a new parser will be used to prevent these issues. Also, when it might happen again, it shows a message there is an issue with the frontmatter.json config and loads the default configuration.