BREAKING(io): remove MultiReader

[iuioiua]

What's changed

MultiReader has been removed from @std/io.

Motivation

This change was made to help push users towards using the Streams API and @std/streams, and make design decisions about which APIs to use easier.

Migration guide

To migrate, combine the corresponding readable streams using mergeReadableStreams.

Before:

import { MultiReader } from "@std/io/multi-reader";
import { StringReader } from "@std/io/string-reader";
import { readAll } from "@std/io/read-all";

const r1 = new StringReader("hello");
const r2 = new StringReader("world");

const reader = new MultiReader([r1, r2]);
const bytes = await readAll(reader);

console.log(new TextDecoder().decode(bytes)); // helloworld

After:

import { mergeReadableStreams } from "@std/streams/merge-readable-streams";
import { toText } from "@std/streams/to-text";

const r1 = ReadableStream.from(["hello"]);
const r2 = ReadableStream.from(["world"]);

const mergedStream = mergeReadableStreams(r1, r2);

console.log(await toText(mergedStream)); // helloworld

Related

Towards #5989

[kt3k]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.74%. Comparing base (6c75ccb) to head (76aa571).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6059      +/-   ##
==========================================
- Coverage   96.76%   96.74%   -0.02%     
==========================================
  Files         512      512              
  Lines       39189    39182       -7     
  Branches     5788     5788              
==========================================
- Hits        37921    37908      -13     
- Misses       1228     1234       +6     
  Partials       40       40              

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