add square-bracket-support

[jantimon]

we got a request to support numeric indexes for yak files e.g.:

import { spacings } from "./constants.yak";

const Button = styled.button`
   margin: ${spacings[0]}
`

this pr uses recursions to allow any combination of computed and uncomputed member expressions like for example:

a.usage["of"][5].member.expressions

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
yacijs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 9, 2024 8:40am

[codspeed-hq]

CodSpeed Performance Report

Merging #66 will not alter performance

_{⚠️ No base runs were found}

_{Falling back to comparing square-bracket-support (22ddff4) with main (64cacab)}

Summary

✅ 2 untouched benchmarks