implement basic patients routes

queries/create_patient.sql

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+insert into patients ("full_name", "phone")
+values($1,$2)
+returning "id";

queries/delete_patient.sql

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+delete from patients
+where id = $1
+returning *;

queries/get_all.sql

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+select * from "patients"

queries/get_patient_by_id.sql

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+select * from "patients"
+where id = $1;

queries/update_patient.sql

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+update patients
+set full_name = $2, phone = $3
+where id = $1;