Add Crypto to PaymentSheet

[ericzhang-stripe]

Summary

Add Crypto to PaymentSheet

Motivation

Add Crypto to PaymentSheet

Testing

Added tests + tested with Basic Non-Card Payment Examples project

Changelog

See diff

[github-actions]

⚠️ Public API changes detected:

StripeCore

- public func caseInsensitiveContains(_ other: Swift.String) -> Swift.Bool
+ @discardableResult
- public mutating func remove(_ element: Element) -> Element?

If you are adding a new public API consider the following:

• Do these APIs need to be public or can they be protected with @_spi(STP)?
• If these APIs need to be public, assess whether they require an API review.

If you are modifying or removing a public API:

• Does this require a breaking version change?
• Do these changes require API review?

If you confirm these APIs need to be added/updated and have undergone necessary review, add the label modifies public API to this PR to acknowledge and bypass this check.

ℹ️ If this comment appears to be left in error, make sure your branch is up-to-date with master.