[Feature]: branch/iteration namer for concurrent operations

[yaythomas]

What would you like?

Name an iteration of map:

const results = await context.map(
  "process-items",
  items,
  async (ctx, item, index) => {
    return await ctx.step(`process-${index}`, async () => process(item));
  },
  {
    maxConcurrency: 5,
    itemNamer: (item, index) => `item-${item.id}`, // Custom iteration names
  },
);

Name a branch of parallel:

const results = await context.parallel(
  "parallel-ops",
  [
    { 
      name: "fetch-user-data",  // Custom name for this branch
      func: async (ctx) => ctx.step(async () => fetchData1()) 
    },
    { 
      name: "fetch-order-history",  // Custom name for this branch
      func: async (ctx) => ctx.step(async () => fetchData2()) 
    },
  ],
  { maxConcurrency: 2 },
);

export interface NamedParallelBranch<TResult, Logger extends DurableLogger> {
  name?: string;
  func: ParallelFunc<TResult, Logger>;
}

Possible Implementation

No response

Is this a breaking change?

No

Does this require an RFC?

No

Additional Context

No response