feat(store): use custom error for deleteCount overflow

[dk1a]

Calling _spliceDynamicData with an overflowing deleteCount, it triggers a default arithmetic error

If it instead triggered Store_InvalidSplice, it would've saved me a couple hours of debugging
I also add tests, for this new behaviour and for the previous way Store_InvalidSplice was used

My used of unchecked isn't important and I can remove it if you don't like it

I assume this is also blocked by audit, so I'm stockpiling PRs for whenever that happens

note to self about updating store logs: pnpm with-anvil vitest --update --hookTimeout=1000000

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[frolic]

ooc is this similar to #3521 ?

[dk1a]

The arithemetic error I replace with a custom error comes from the definition of previousFieldLength, which is unchanged in #3521
The error alvarius changes is unrelated and happens later

(edited after realizing it's even less related than I initially thought, in case you read the previous version)