feat(aci): Setup dataset, interval, aggregate function, filter (#94002)

Adds a dataset + interval dropdown.
Starts implementation for aggregate function heavily based on the new
dashboard widget creation. On the form model itself the aggregate is
stored as the full query function `count_unique(user.id)` and parsed
into the fields. Some fields can get pretty complicated since some have
multiple parameters or parameters are inputs instead of dropdowns.

Can't seem to get crash alerts working yet, might need examples of the
expected payloads.

<img width="898" alt="image"
src="https://github.com/user-attachments/assets/a893b201-8761-49a5-95dc-08449810c00c"
/>

Author: scttcper

static/app/views/detectors/components/forms/customMeasurements.tsx

@@ -0,0 +1,57 @@
+import {useMemo} from 'react';
+import type {Query} from 'history';
+
+import {getFieldTypeFromUnit} from 'sentry/components/events/eventCustomPerformanceMetrics';
+import {normalizeDateTimeParams} from 'sentry/components/organizations/pageFilters/parse';
+import type {PageFilters} from 'sentry/types/core';
+import type {Organization} from 'sentry/types/organization';
+import type {CustomMeasurementCollection} from 'sentry/utils/customMeasurements/customMeasurements';
+import {useApiQuery} from 'sentry/utils/queryClient';
+
+type MeasurementsMetaResponse = Record<string, {functions: string[]; unit: string}>;
+
+export function useCustomMeasurements(
+  organization: Organization,
+  selection?: PageFilters
+) {
+  const query: Query = selection?.datetime
+    ? normalizeDateTimeParams(selection.datetime)
+    : {};
+
+  if (selection?.projects) {
+    query.project = selection.projects.map(String);
+  }
+
+  const {data, isLoading, isError} = useApiQuery<MeasurementsMetaResponse>(
+    [`/organizations/${organization.slug}/measurements-meta/`, {query}],
+    {
+      staleTime: Infinity,
+    }
+  );
+
+  const customMeasurements = useMemo(() => {
+    if (!data) {
+      return {};
+    }
+
+    return Object.entries(data).reduce<CustomMeasurementCollection>(
+      (acc, [customMeasurement, measurementData]) => {
+        acc[customMeasurement] = {
+          key: customMeasurement,
+          name: customMeasurement,
+          functions: measurementData.functions,
+          unit: measurementData.unit,
+          fieldType: getFieldTypeFromUnit(measurementData.unit),
+        };
+        return acc;
+      },
+      {}
+    );
+  }, [data]);
+
+  return {
+    customMeasurements,
+    isLoading,
+    isError,
+  };
+}

static/app/views/detectors/components/forms/getDatasetConfig.tsx

@@ -0,0 +1,23 @@
+import {ErrorsConfig} from 'sentry/views/dashboards/datasetConfig/errors';
+import {ReleasesConfig} from 'sentry/views/dashboards/datasetConfig/releases';
+import {SpansConfig} from 'sentry/views/dashboards/datasetConfig/spans';
+import {TransactionsConfig} from 'sentry/views/dashboards/datasetConfig/transactions';
+import {DetectorDataset} from 'sentry/views/detectors/components/forms/metricFormData';
+
+/**
+ * @returns a configuration object used to display the aggregate function selector and the search bar
+ */
+export function getDatasetConfig(dataset: DetectorDataset) {
+  switch (dataset) {
+    case DetectorDataset.ERRORS:
+      return ErrorsConfig;
+    case DetectorDataset.TRANSACTIONS:
+      return TransactionsConfig;
+    case DetectorDataset.RELEASES:
+      return ReleasesConfig;
+    case DetectorDataset.SPANS:
+      return SpansConfig;
+    default:
+      return ErrorsConfig;
+  }
+}