feat(gnoweb): change build-in playground run view to use CodeMirror

[jeronimoalbi]

The new built-in Playground changes include a run view where Gno code for run TXs can be written. This PR changes the textarea for a CodeMirror editor, the same used by the Playground, same configuration.

The gnokey commands copy buttons were moved into "inline" copy icons to follow Gnoweb patterns.

Related to #5421

[Gno2D2]

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[jeronimoalbi]

Run view using CodeMirror editor and copy icons for gnokey commands:

[codecov]

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