BREAKING(io): remove BufWriter

[iuioiua]

What's changed

BufWriter has been removed from @std/io

Motivation

This change was made to help push users towards using the Streams API and @std/streams.

Migration

To migrate, use Buffer from @std/streams instead. If you have any use cases which lack a clear means of migration, open an issue.

Before:

import { BufWriter } from "@std/io";
import { assertEquals } from "@std/assert/equals";

const writer = Deno.stdout;

const bufWriter = new BufWriter(writer, 1024);
await bufWriter.write(new Uint8Array([65, 66, 67]));

After:

import { Buffer } from "@std/streams/buffer";

const writable = Deno.stdout.writable;

const buffer = new Buffer();
buffer.grow(1024);

buffer.readable.pipeTo(writable);

const writer = buffer.writable.getWriter();
await writer.write(new Uint8Array([65, 66, 67]));

part of #5989

[kt3k]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.72%. Comparing base (0023c53) to head (7fbb618).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6057      +/-   ##
==========================================
+ Coverage   96.62%   96.72%   +0.10%     
==========================================
  Files         515      514       -1     
  Lines       39493    39300     -193     
  Branches     5827     5801      -26     
==========================================
- Hits        38160    38013     -147     
+ Misses       1292     1246      -46     
  Partials       41       41              

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