feat: deprecate estimateSize and use v8 serialisation directly

[kitsonk]

Deploy now supports accessing v8 serialize via "node:v8" which means everywhere you would reasonable run Deno KV (including Bun) supports serialize from "node:v8". This effectively makes the functionality in

Previously, the performance in Deno of serialize was poor, but recent versions have it faster than the original estimation function:

    CPU | Apple M1 Pro
Runtime | Deno 2.3.5 (aarch64-apple-darwin)

file:///.../estimate_size.bench.ts

benchmark      time/iter (avg)        iter/s      (min … max)           p75      p99     p995
-------------- ----------------------------- --------------------- --------------------------
estimateSize            7.6 µs       131,500 (  4.1 µs … 826.6 µs)   5.0 µs  48.4 µs  51.5 µs
V8 serialize            5.7 µs       174,000 (  4.0 µs …   8.1 µs)   7.0 µs   8.1 µs   8.1 µs

Based on this, estimateSize is redundant and less accurate than using serialize directly and should be deprecated and eventually removed.

[kt3k]

Makes sense.

LGTM

[kt3k]

published as 0.1.4 https://jsr.io/@deno/kv-utils@0.1.4