Add Gas Benchmarking Tests for WebAuthn Signer

[nlordell]

This PR adds gas benchmarking tests for the WebAuthn signer. Note that we got rid of the MultipleVerifiers.spec.ts file, as it is essentially the new gas benchmarking tests, and there was no need to duplicate the work.

The benchmarks look like this:

  Gas Benchmarking
    WebAuthnSigner
      ⛽ deployment: 612123
      ✔ Benchmark signer deployment cost (694ms)
      ⛽ verification (FreshCryptoLib): 219365
      ✔ Benchmark signer verification cost with FreshCryptoLib verifier (172ms)
      ⛽ verification (daimo-eth): 351273
      ✔ Benchmark signer verification cost with daimo-eth verifier (201ms)
      ⛽ verification (Dummy): 13835
      ✔ Benchmark signer verification cost with Dummy verifier

Note that we include a "dummy" benchmark, this is because gas consumption of P-256 signature verification is unstable, and this allows us to better compare gas characteristics of the WebAuthn signing message computation overhead.

Furthermore, we remove the check on whether or not the P-256 verifier has code. This is important as precompiles have no code, so our WebAuthn stuff wouldn't work with precompiles without this change.

[coveralls]

Pull Request Test Coverage Report for Build 8338690017

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+62.2%) to 76.923%

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Totals
Change from base Build 8328723798:	62.2%
Covered Lines:	131
Relevant Lines:	155

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💛 - Coveralls

[remedcu]

One doubt, rest LGTM 👍🏾