NPA-3543: add initial /Consent endpoint and associated schema refacto…

…ring (#105)

* NPA-3543: add initial /Consent endpoint and associated schema refactoring

* NPA-3543: definition of the Consent schema

* NPA-3543: add query parameter definitions for /consent

* NPA-3543: add bundle response examples

* NPA-3543: update description to distinguish between calls to obtain verified relationship and a proxy relationship

* NPA-3543: minor copy amends based on PR feedback

* NPA-3543: add optional IM1 connection params header

* NPA-3543: add initial set of 4xx error codes for /Consent

* NPA-3543: manual merge of changes that git can't automatically resolve

* NPA-3543: add generalPractitioner to patient resource to enable us to surface ODS code

* NPA-3543: fixup erroneous FHIR schema elements

* NPA-3543: remove deprecated search mode (outcome)

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Co-authored-by: James Taylor <jamesh.taylor@bjss.com>