Added constraints to models to not allot multiple patients the same bed

[siddnikh]

Proposed Changes

• Added constraint in ConsultationBed model so no 2 patients can be allotted the same bed.
• Added constraint in PatientConsultation model so no 2 patients can be allotted the same bed provided both of them are admitted.

Associated Issue

Issue #898

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[siddnikh]

@vigneshhari I tried adding a patient to the same bed, except we don't get that bed listed when we're trying to add another patient.

[gigincg]

Already Resolved in https://github.com/coronasafe/care/pull/854

cc: @vigneshhari