Add nix and upgrade node

[airhorns]

So we're all using the same version when comparing benchmarks. Regrettably, there's a huge performance regression on newer nodes! I am going to work on that next, but at least with a nix setup we're comparing apples to apples.

❯ node --version
v21.1.0
❯ p x bench/create-many-different-roots.ts

> @gadgetinc/[email protected] x /Users/airhorns/Code/mobx-quick-tree
> ts-node --transpile-only "bench/create-many-different-roots.ts"

instantiating a large root x 3,047 ops/sec ±1.32% (99 runs sampled)
instantiating a small root x 11,136,120 ops/sec ±0.47% (100 runs sampled)
instantiating a diverse root x 449,239 ops/sec ±0.16% (98 runs sampled)

❯ node --version
v20.9.0
❯ p x bench/create-many-different-roots.ts

> @gadgetinc/[email protected] x /Users/airhorns/Code/mobx-quick-tree
> ts-node --transpile-only "bench/create-many-different-roots.ts"

instantiating a large root x 3,243 ops/sec ±0.56% (98 runs sampled)
instantiating a small root x 11,026,548 ops/sec ±0.14% (98 runs sampled)
instantiating a diverse root x 461,517 ops/sec ±0.15% (100 runs sampled)

❯ node --version
v18.18.2
❯ p x bench/create-many-different-roots.ts
> @gadgetinc/[email protected] x /Users/airhorns/Code/mobx-quick-tree
> ts-node --transpile-only "bench/create-many-different-roots.ts"

instantiating a large root x 4,876 ops/sec ±0.56% (98 runs sampled)
instantiating a small root x 9,065,427 ops/sec ±0.89% (93 runs sampled)
instantiating a diverse root x 638,657 ops/sec ±1.81% (97 runs sampled)

[thegedge]

👍

Until we fix the regression, how do you feel about adding this to package.json:

  "engines" : { 
    "node" : "<20.0.0"
  }

[airhorns]

Enh, I feel like it really does run on all of them and we know it is an issue, we'll have to fix it soon so I think we just shouldn't cut a release until its fixed or we give up?