adds missing endpoints in tasks-svc (#768)

* feat: add patient handlers registry

* protos: add task endpoints

* feat: getTasksByPatient

* feat: getTasksByPatientSortedByStatus

* feat: getAssignedTasks

* feat: getPatientByBed

* feat: getPatientsByWard

* feat: getPatientDetails

* feat: getPatientList

* modelling and protoing

* cleanup

* finetuning

* revive bed_id constraint

* remove unused params

* one more thing

* feat: add taskStatusUpdated event

* feat: add taskStatusUpdated to projection

* feat: add timestamp to metadata

* protos

* tidy

* test

* models

* back

* imports

* again

* fix: use right eventListener

* fix

* add reasoning

* fix: assignedUser to nullUUID

* protos

* fix: alter tests

* models

* fix: add authz

* fix: compatability constraints

* fix: database schema

* formatting