feat: Split-large-code-file-functions

[Shyam-Raghuwanshi]

What does this PR do?
this PR Identify and Split the Large Code Files

Fixes #12559

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[keithwillcode]

I don't want to introduce a new modules folder right now. Let's just keep these new files in packages/features/bookings/lib and we can reassess a new file structure and architecture later.

Also, the function getAllCredentials was ok as a name when it lived in handleNewBooking.ts but now as a standalone function doesn't make sense. getAllCredentials with no context makes the user of said function think it will literally get all credentials.

Let's rename it to something like `getAllCredentialsForUsersOnEvent'.