fix(analytics): use HashSet to represent the returned metrics

[lsampras]

Currently we have 2 sources for analytics Clickhouse & Sqlx
Along with this we have a combined mode which helps compare for any differences in these results
However since currently we return a vector of results this causes an mismatch warning if the order is changed,
instead we should use a HashSet to store & compare these values.

hyperswitch/crates/analytics/src/api_event/metrics.rs

Lines 41 to 50 in d4dba55

	async fn load_metrics(
	&self,
	dimensions: &[ApiEventDimensions],
	merchant_id: &str,
	filters: &ApiEventFilters,
	granularity: &Option<Granularity>,
	time_range: &TimeRange,
	pool: &T,
	) -> MetricsResult<Vec<(ApiEventMetricsBucketIdentifier, ApiEventMetricRow)>>;
	}

we can also add a Counter metric to determine whenever these metrics are incorrect.