AG-6654 - Charts API Explorer Caching + Visual Improvements

[alantreadway]

https://ag-grid.atlassian.net/browse/AG-6654

Primary changes:

• During re-render we are reloading and rebuilding the entire JsonModel - this change seeks to remove this calculation from the re-render path by introducing caching. (1011e65)
• Fixes small-screen rendering of the API Explorer - we no longer continue squishing things to the point of uselessness, but add scroll-bars to allow the content to be moved into view. (aaae9d3)
• Makes the chart theme configurable interactively and adds JSDoc description for the field to improve self-documentation. (c81b4bd)

Bonus:

• Improves marker shape typings. (28ab806)
• Fixes an edge case in the rendering of primitive unions, where we previously assumed all elements were string literal types. (c0b19e9)

Theme option beforehand:

Theme option after:

[manapeirov]

Is the any for the (new () => any) case?

[alantreadway]

Yes - my original motivation was that a JSONSchema generator I was trying to use was failing on the previous new () => void - I don't think this is a significant degradation of the type information, given the generality of the previous definition?

[manapeirov]

agreed

[manapeirov]

Looks good!