Smarter splitting by ;

[Akeboshiwind]

Currently xt-fiddle can break if there's a semicolon in a string.

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Some ideas for solutions:

1. Improve splitter to know when it's in a string and unescaped
   • Downside to this is that it has to be replicated in the docs fiddle as well
2. Split each transaction into it's own editor in the UI
   • I think this would look crap tbh
3. Ask for support for semicolons in the xtdb sql api
   • I was chatting w/ Joe and he thought this would probably be for the best anyway as other tools will probably want/need this support too
   • As well as this enables us to support copy-pasting multiple txs from the docs and other places too

[Akeboshiwind]

xtdb/xtdb#3242