feat(conform-react): add support of descriptionId

[edmundhung]

Resolve #120

This adds support of descriptionId which could be used to setup an input hint similar to the existing errorId. But to utilize it, it is also required to provide an extra option description: true to the conform helpers which will setup the aria-describedby accordingly.

<input {...conform.input(email, { type: "email" })} />
// If valid, no aria attributes will be set
// If invalid, aria-invalid="true" aria-describedby="errorId"

<input {...conform.input(email, { type: "email", description: true })} />
// If valid, aria-describedby="descriptionId"
// If invalid, aria-invalid="true" aria-describedby="errorId descriptionId"

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