perf(ext/node): improve `Buffer` from string performance (#24567)

Fixes https://github.com/denoland/deno/issues/24323

- Use a Buffer pool for `fromString`
- Implement fast call base64 writes
- Direct from string `create` method for each encoding op

```
$ deno bench -A bench.mjs # 1.45.1+fee4d3a
cpu: Apple M1 Pro
runtime: deno 1.45.1+fee4d3a (aarch64-apple-darwin)

benchmark                time (avg)             (min … max)       p75       p99      p999
----------------------------------------------------------- -----------------------------
Buffer.from base64      550 ns/iter     (490 ns … 1'265 ns)    572 ns    606 ns  1'265 ns
Buffer#write base64     285 ns/iter       (259 ns … 371 ns)    307 ns    347 ns    360 ns

$ ~/gh/deno/target/release/deno bench -A bench.mjs # this PR
cpu: Apple M1 Pro
runtime: deno dev (aarch64-apple-darwin)

benchmark                time (avg)             (min … max)       p75       p99      p999
----------------------------------------------------------- -----------------------------
Buffer.from base64      151 ns/iter       (145 ns … 770 ns)    148 ns    184 ns    648 ns
Buffer#write base64   62.58 ns/iter     (60.79 ns … 157 ns)  61.65 ns  75.79 ns    141 ns

$ node bench.mjs # v22.4.0
cpu: Apple M1 Pro
runtime: node v22.4.0 (arm64-darwin)

benchmark                time (avg)             (min … max)       p75       p99      p999
----------------------------------------------------------- -----------------------------
Buffer.from base64      163 ns/iter     (96.92 ns … 375 ns)  99.45 ns    127 ns    220 ns
Buffer#write base64   75.48 ns/iter     (74.97 ns … 134 ns)  75.17 ns  81.83 ns  96.84 ns
```

1 files changed, 6 insertions, 2 deletions

diff --git a/tests/unit_node/zlib_test.ts b/tests/unit_node/zlib_test.ts
index 215717dde..657433f11 100644
--- a/tests/unit_node/zlib_test.ts
+++ b/tests/unit_node/zlib_test.ts
@@ -123,7 +123,9 @@ Deno.test(
 
 Deno.test("should work with dataview", () => {
   const buf = Buffer.from("hello world");
-  const compressed = brotliCompressSync(new DataView(buf.buffer));
+  const compressed = brotliCompressSync(
+    new DataView(buf.buffer, buf.byteOffset, buf.byteLength),
+  );
   const decompressed = brotliDecompressSync(compressed);
   assertEquals(decompressed.toString(), "hello world");
 });
@@ -141,7 +143,9 @@ Deno.test(
   "zlib compression with dataview",
   () => {
     const buf = Buffer.from("hello world");
-    const compressed = gzipSync(new DataView(buf.buffer));
+    const compressed = gzipSync(
+      new DataView(buf.buffer, buf.byteOffset, buf.byteLength),
+    );
     const decompressed = unzipSync(compressed);
     assertEquals(decompressed.toString(), "hello world");
   },