Make buffer.toString("base64") 4x faster

[Jarred-Sumner]

This adds https://github.com/aklomp/base64 as a dependency to Bun, which is the same library that Node uses.

cpu: Apple M1 Max
runtime: bun 0.6.13_debug (arm64-darwin)

benchmark                      time (avg)             (min … max)       p75       p99      p995
----------------------------------------------------------------- -----------------------------
Buffer.toString('base64')   40.41 µs/iter    (12.5 µs … 10.22 ms)  15.58 µs 561.83 µs   1.13 ms

❯ bun
cpu: Apple M1 Max
runtime: bun 0.6.12 (arm64-darwin)

benchmark                      time (avg)             (min … max)       p75       p99      p995
----------------------------------------------------------------- -----------------------------
Buffer.toString('base64')  269.96 µs/iter     (177 µs … 38.42 ms) 186.92 µs 905.17 µs   3.41 ms

❯ node
cpu: Apple M1 Max
runtime: node v20.1.0 (arm64-darwin)

benchmark                      time (avg)             (min … max)       p75       p99      p995
----------------------------------------------------------------- -----------------------------
Buffer.toString('base64')  129.44 µs/iter    (22.08 µs … 6.61 ms)  57.79 µs   1.65 ms   2.02 ms


❯ deno
cpu: unknown
runtime: deno 1.34.2 (aarch64-apple-darwin)

benchmark                      time (avg)             (min … max)       p75       p99      p995
----------------------------------------------------------------- -----------------------------
Buffer.toString('base64')   154.7 µs/iter   (36.29 µs … 12.95 ms) 105.54 µs   1.44 ms   1.91 ms

[github-actions]

❌ @Jarred-Sumner 5 files with test failures on linux-x64:

• test/cli/install/bun-run.test.ts
• test/js/bun/websocket/websocket-server.test.ts
• test/js/node/watch/fs.watch.test.js
• test/js/web/fetch/fetch-leak.test.js
• test/js/web/websocket/websocket.test.js

View test output

^{#a85491844be447df43beb78137255145f6a3bf47}

[github-actions]

❌ @Jarred-Sumner 8 files with test failures on bun-darwin-aarch64:

• test/cli/install/bun-run.test.ts
• test/js/bun/net/socket.test.ts
• test/js/bun/spawn/spawn.test.ts
• test/js/bun/test/snapshot-tests/__snapshots__/bun-snapshots.test.ts.snap
• test/js/bun/test/test-test.test.ts
• test/js/bun/util/error-gc-test.test.js
• test/js/bun/websocket/websocket-server.test.ts
• test/js/web/websocket/websocket.test.js

View test output

^{#a85491844be447df43beb78137255145f6a3bf47}

[github-actions]

❌ @Jarred-Sumner 5 files with test failures on linux-x64-baseline:

• test/cli/install/bun-run.test.ts
• test/js/bun/websocket/websocket-server.test.ts
• test/js/node/watch/fs.watch.test.js
• test/js/web/fetch/fetch-leak.test.js
• test/js/web/websocket/websocket.test.js

View test output

^{#a85491844be447df43beb78137255145f6a3bf47}

[github-actions]

❌ @Jarred-Sumner 8 files with test failures on bun-darwin-x64-baseline:

• test/cli/install/bun-run.test.ts
• test/js/bun/spawn/spawn-streaming-stdin.test.ts
• test/js/bun/sqlite/sqlite.test.js
• test/js/bun/util/error-gc-test.test.js
• test/js/bun/websocket/websocket-server.test.ts
• test/js/third_party/webpack/webpack.test.ts
• test/js/web/timers/setTimeout.test.js
• test/js/web/websocket/websocket.test.js

View test output

^{#a85491844be447df43beb78137255145f6a3bf47}

[L3P3]

Why commented out? Useful benchmark!