Add BigDecimal

[jessekelly881]

Closes #576

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@effect/schema	Patch

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[jessekelly881]

@fubhy What do you think the "default" decoder should be here? I.e. what should Schema.BigDecimal decode from? Currently I've defined it as Schema.BigDecimal :: Schema<string, BigDecimal> which seems to make the most sense. But I'm not 100% sure if this is the best option.

I've played around with Schema.BigDecimal :: Schema<[value: bigint, scale: number], BigDecimal> as well, similar to Duration, but I'm not a huge fan of that.

[fubhy]

I think it should be Schema<string, BigDecimal> where both values are the normalized representation (optimized for scaled).

[jessekelly881]

Sounds good! I added normalization when decoding to/from a string as well.