Updates beta branch with changes in master

[jar-stripe]

Why?

We just launched a major version of the SDK and we need to update our beta SDK to match. This PR contains a merge from the master branch and manual fixes/removal of replaced or obsolete files

What?

• merge from the master branch
• remove preview.py and test_preview.py
• remove _raw_request.py and references from stripe init.py

Codegen for openapi v1268.

Changelog

• Add support for reporting_chart on parameter class stripe.AccountSession.CreateParamsComponents
• Add support for total_pretax_credit_amounts on resource stripe.QuotePreviewInvoice
• Add support for allow_redisplay on parameter class stripe.terminal.Reader.CollectPaymentMethodParamsCollectConfig
• Remove support for from_schedule on resource class stripe.Quote.SubscriptionData
• Move raw_request and related methods from _raw_request module to the StripeClient class
• Remove _preview module; use raw request methods in the StripeClient class instead

[ramya-stripe]

I copied over the changelog entries from #1396

Can we add one for moving the raw request to StripeClient and how there is no "preview" layer anymore?