auth: Use webcrypto & Uint8Array instead of NodeJS crypto & Buffer

[dwardu]

Problem

The current auth implementation makes use of NodeJS crypto package and Buffer, and because of this the library cannot be used in contexts where these are unavailable, such as on Cloudflare workers.

Solution

The solution was to replace NodeJS primitives with their standard counterparts.

Result

As a result of the changes in this PR, it will be possible to use the library on environments where NodeJS crypto and Buffer are not available, such as Cloudflare workers.

[CLAassistant]

All committers have signed the CLA.

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