feat(client): add latency histogram (#3099)

* add latency histogram command, tests (##1955)

packages/client/lib/commands/LATENCY_HISTOGRAM.ts

@@ -0,0 +1,46 @@
+import { CommandParser } from '../client/parser';
+import { Command } from '../RESP/types';
+import { transformTuplesToMap } from './generic-transformers';
+
+type RawHistogram = [string, number, string, number[]];
+
+type Histogram = Record<string, {
+  calls: number;
+  histogram_usec: Record<string, number>;
+}>;
+
+const id = (n: number) => n;
+
+export default {
+  CACHEABLE: false,
+  IS_READ_ONLY: true,
+  /**
+   * Constructs the LATENCY HISTOGRAM command
+   *
+   * @param parser - The command parser
+   * @param commands - The list of redis commands to get histogram for
+   * @see https://redis.io/docs/latest/commands/latency-histogram/
+   */
+  parseCommand(parser: CommandParser, ...commands: string[]) {
+    const args = ['LATENCY', 'HISTOGRAM'];
+    if (commands.length !== 0) {
+      args.push(...commands);
+    }
+    parser.push(...args);
+  },
+  transformReply: {
+    2: (reply: (string | RawHistogram)[]): Histogram => {
+      const result: Histogram = {};
+      if (reply.length === 0) return result;
+      for (let i = 1; i < reply.length; i += 2) {
+        const histogram = reply[i] as RawHistogram;
+        result[reply[i - 1] as string] = {
+          calls: histogram[1],
+          histogram_usec: transformTuplesToMap(histogram[3], id),
+        };
+      }
+      return result;
+    },
+    3: undefined as unknown as () => Histogram,
+  }
+} as const satisfies Command;