add create metric api along with changes in ExperimentEntity

litmus-liquibase/src/main/resources/db/changelog/202302131535-add-metrics-table.sql

@@ -6,7 +6,7 @@ CREATE TABLE metrics (
                           metric_id varchar(36) NOT NULL,
                           metric_name varchar(100) NOT NULL,
                           metric_type varchar(100) NOT NULL,
-                          metric_owner varchar(100) NOT NULL,
+                          metric_owner jsonb,
                           athena_query text NOT NULL,
                           version BIGINT,
                           created_at timestamp,

litmus-liquibase/src/main/resources/db/changelog/202302132341-add-enhancement-columns-in-experiment.sql

@@ -0,0 +1,12 @@
+--liquibase formatted sql
+
+--changeset author:akshatsonic id:202302132341
+
+ALTER TABLE experiments
+    ADD primary_metric VARCHAR,
+    ADD secondary_metric VARCHAR,
+    ADD sample_size_required BIGINT,
+    ADD baseline_conversion FLOAT(2),
+    ADD minimum_detectable_effect FLOAT(2),
+    ADD confidence_interval FLOAT(2),
+    ADD test_users BIGINT;