docs: add installation instructions for bun

[colinhacks]

Adds instructions for Bun package manager to the readme

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: colinhacks / name: Colin McDonnell (a33fe7d)

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@colinhacks The latest changes of this PR are available on NPM as
graphql@17.0.0-alpha.2.canary.pr.3957.454033bcee41c456acce935e49e3e420b75115e4
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@colinhacks Please, see benchmark results here: https://github.com/graphql/graphql-js/actions/runs/6053389115/job/16428775144#step:6:1