Update code editor library to monaco

[ohltyler]

Currently, this plugin uses the legacy EuiCodeEditor which uses ace library under the hood. This is deprecated in favor of the monaco-based CodeEditor component in OSD. However, the version of monaco is >5 years old now, primarily due to webpack issues. This version has bugs, missing features, and in general not good documentation.

Once webpack is upgraded and the monaco dependency is updated, we can switch to use that.

I have a basic working implementation of using the new editor here: https://github.com/ohltyler/dashboards-flow-framework/tree/code-editor
Once the dependency is updated, a rebase and bootstrap on that branch should bring everything up-to-date.