Added static client_attribution_metadata fields to API requests on payment method tokenization

[joyceqin-stripe]

Summary

Added client attribution metadata with fields client_session_id, merchant_integration_source, merchant_integration_subtype, and merchant_integration_version

Under payment_method_data[client_attribution_metadata] in API calls for confirmPaymentIntent, confirmSetupIntent.
Top-level under client_attribution_metadata for createPaymentMethod
Under payment_method_options[client_attribution_metadata] for sharePaymentDetails.

More client_attribution_metadata fields to come, but I thought I'd just get this one out first for less complexity.

A lot of files changed, but they're almost all network stubs

Motivation

MOBILESDK-3759
For more context, here are all the notes I have at the moment: https://docs.google.com/document/d/1NNTf3TKRJ6Ftgk6PYtDjPMSAYU-RMUezUjGndJr81Eg/edit?usp=sharing

Testing

Network stubs, manually inspected requests
confirmPaymentIntent request: https://admin.corp.stripe.com/request-log/req_3jspitgU8NcFUm
confirmSetupIntent request: https://admin.corp.stripe.com/request-log/req_E3hihx6DTYAYhy
createPaymentMethod request: https://admin.corp.stripe.com/request-log/req_gwBYjtzWxvCqPx
sharePaymentDetails request: https://admin.corp.stripe.com/request-log/req_OHbC2Nv9lfc2ot
createPaymentMethod request from ApplePay: https://admin.corp.stripe.com/request-log/req_0qmm7pYZxY1R72

Changelog

N/A

[github-actions]

⚠️ Public API changes detected:

StripePaymentSheet

- case flatWithDisclosure
+ case flatWithChevron
- public var disclosure: StripePaymentSheet.PaymentSheet.Appearance.EmbeddedPaymentElement.Row.Flat.Disclosure
- public var chevron: StripePaymentSheet.PaymentSheet.Appearance.EmbeddedPaymentElement.Row.Flat.Chevron
- public struct Disclosure : Swift.Equatable {
- public struct Chevron : Swift.Equatable {
- public static func == (a: StripePaymentSheet.PaymentSheet.Appearance.EmbeddedPaymentElement.Row.Flat.Disclosure, b: StripePaymentSheet.PaymentSheet.Appearance.EmbeddedPaymentElement.Row.Flat.Disclosure) -> Swift.Bool
- public static func == (a: StripePaymentSheet.PaymentSheet.Appearance.EmbeddedPaymentElement.Row.Flat.Chevron, b: StripePaymentSheet.PaymentSheet.Appearance.EmbeddedPaymentElement.Row.Flat.Chevron) -> Swift.Bool

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

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

[yuki-stripe]

👀 huh this is like, doing the opposite now - why'd we make this change? Seems like it'd make sense to clear the session ID before every network test?

[joyceqin-stripe]

I originally added the clearSessionID there when I was adding mobile_session_id to the API call to retrieve an ElementsSession so that network tests wouldn't hit the live network unless I explicitly generated a session ID. However, all of those network tests that would have been affected have had their stubs changed in this PR, and now that I've edited the paramsAddingClientAttributionMetadata to not include client_session_id in the request unless it's non-nil, it feels like it would make more sense to always generate a session ID and include client_attribution_metadata[client_session_id] in all the stubs

[joyceqin-stripe]

Actually not all of those original network tests that would have been affected are affected here, I can revert to clearing the session ID but I'll have to rerecord these tests