Use TextDecoder for Buffer.toString?

I have some pretty large buffers (~45MB) I'm decoding, and they can create a large "GC pressure"

With TextDecoder
start: 42ms

With buffer.toString()
start: 838.85302734375ms

I know there have been discussions about TextEncoder/TextDecoder in the past, but thought I'd mention the performance boost here

Linking to #60 for reference

parse-sax: use native TextDecoder in browser when available

browser: use TextDecoder and TextEncoder for buffer

xlsx: use TextDecoder and TextEncoder in browser

I'm open to merging a PR that switches to TextDecoder. If you would like to see it implemented, please send a pull request!

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