chore: QOL improvements

[robhanlon22]

• Move default blocklist to its own file so class Sqids is visible upon opening
• Export minAlphabetLength, minLengthLimit, and maxValue so they're available to downstream consumers
• Enforce Required<SqidsOptions> type on defaultOptions

[4kimov]

@robhanlon22 Thanks for the PR. Two questions for you:

1. Shouldn't newly exported constants be screaming snake case since that's typically the convention for hardcoded values?
2. I do like the blocklist moved to a separate file, it's cleaner. Did you check if building the package worked nicely with it being moved? For some reason last time I couldn't get it to package properly.

[robhanlon22]

1. Shouldn't newly exported constants be screaming snake case since that's typically the convention for hardcoded values?

Sure, I can do that. I was following the convention of defaultOptions here, but I can change them. I'll also alias defaultOptions to DEFAULT_OPTIONS.

2. I do like the blocklist moved to a separate file, it's cleaner. Did you check if building the package worked nicely with it being moved? For some reason last time I couldn't get it to package properly.

Sure, I'll try it out, and see if anything needs tweaking.

[4kimov]

@robhanlon22 Cool, thank you.

Regarding naming convention, I always thought this approach was reasonable for JS: https://stackoverflow.com/a/49537197