Types Bundler: Add debugger and process args

[jackw]

What this PR does / why we need it: This PR adds the following to the types-bundler package:

• [x] Split out default args from parseArgs so we have more control over processing args
• [x] add a debugger
• [x] handle cases where empty strings are passed as args and check entry-point file exists

Which issue(s) this PR fixes:

Related grafana/grafana/issues/90171

Special notes for your reviewer:

📦 Published PR as canary version: Canary Versions

:sparkles: Test out this PR locally via: ```bash npm install @grafana/plugin-types-bundler@0.0.6-canary.1269.593a35b.0 # or yarn add @grafana/plugin-types-bundler@0.0.6-canary.1269.593a35b.0 ```

[github-actions[bot]]

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[grafana-plugins-platform-bot[bot]]

:rocket: PR was released in @grafana/plugin-types-bundler@0.0.6 :rocket: