Making the k6/experimental/webcrypto module part of the k6 core

[oleiade]

A few releases back, we introduced the k6/experimental/webcrypto module to k6.

Experimental modules intend to become part of the core eventually. We intend to eventually have the webcrypto module become part of the core too.

However, the current state of the module is that most of the API we intend to cover is present, but its implementation is only partial. Currently, only certain functionalities are implemented, and only a subset of the specifications' algorithms are supported.

As a result, this issue intends to define the steps left to complete to reach a state that we deem acceptable for the webcrypto module to become stable.

Left to address

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1. Adjust an extract array buffer logic xk6-webcrypto#72
   WebCrypto API Compliant bug +2
2. Implement support for the JWK format xk6-webcrypto#37
   enhancement +1
   
3. Implement support for ECDH across the supported APIs xk6-webcrypto#49
   4 of 4
   enhancement +1
   
4. Implement support for ECDSA across the supported APIs xk6-webcrypto#48
   5 of 5
   enhancement +1
   
5. Implement support for RSA across the supported APIs xk6-webcrypto#47
   0 of 7
   enhancement +1
   
6. Reactivate sign/verify HMAC tests relying on ECDSA key generation xk6-webcrypto#41
   enhancement +1
   
7. Migrate from the direct runtime access throw the go routines xk6-webcrypto#71
   +0
   
8. Make webcrypto avaliable globaly as crypto #4031
   +0
9. Remove experimental webcrypto

Note that this list might be incomplete in some ways, and will likely get updated as we progress towards addressing those issues and limitations ⚠️