add hideCardNicknameField to PaymentSheet.Configuration

[Pradeep-kumar1202]

Description:

What

Exposes hideCardNicknameField on PaymentSheet.Configuration, matching the new
client-core prop.

How

Five sites, following splitCardFields exactly:

• Configuration data-class param val hideCardNicknameField: Boolean? = null
• bundle getter — putBoolean guarded on non-null
• Builder private var, builder setter, and the positional arg in build()

Uses the nullable Boolean? = null builder default (as splitCardFields/stickyPayButton
do) rather than the non-null style used by displaySavedPaymentMethodsCheckbox — a non-null
default would make the Builder always emit the key and override the ReScript default.

Appended last so @JvmOverloads and existing positional callers stay source-compatible.
@Parcelize generates the parcelling.

Usage

PaymentSheet.Configuration.Builder("Example, Inc.")
    .hideCardNicknameField(true)
    .build()