feat: adds codeMirrorLoaded that fires after codeMirror set

[sp90]

This solves: #145

[sp90]

Problem with using

  @ViewChild(CodeMirrorComponent) set editor(editor: CodeMirrorComponent) {
    console.log('editor.codeMirror: ', editor.codeMirror);
  }

is that codeMirror is not set here, but only after the codeMirror instance is set which is afterViewInit, so this happens after `viewChild is initiated

And to avoid clunky setTimout code I think it's a quality of life improvement needed to be added

[scttcper]

seeing a type error

Error: src/lib/codemirror.component.ts:131:12 - error TS2339: Property 'onLoad' does not exist on type 'CodemirrorComponent'.

[sp90]

@scttcper its been solved

[scttcper]

🎉 This PR is included in version 6.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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