PS-536: Added recaptcha token as an optional parameter

[CodyAntcliffeCoconut]

Description

Change updates the Appointments API to allow for an optional Recaptcha Token parameter

Motivation and context

This will allow the backend to perform a recaptcha check against the request

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or closes #num, the issue will be automatically closed when the pull is accepted.)

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[craigpaul]

We should probably update the README with some information about this new method and some sort of caveat about it being reliant on a specific feature, etc.